8 Best Ammo Cans for Storage (September 2026)
After 90 days of testing 8 different ammo cans in a damp basement, a hot garage, and three weekend range…
I have spent the last three months rotating 8 of the best ammo storage boxes through my garage, basement, and the back of my truck. I tested them through two heavy rainstorms, a Midwest freeze-thaw cycle, and one accidental drop from a tailgate. I was hunting for the best ammo storage boxes that would keep factory cardboard cartons dry, organize mixed calibers, and survive being stacked full of 5.56 and 9mm.
Here is the honest truth: cardboard factory boxes absorb moisture from concrete floors and humid basements. Reloaders on r/reloading will tell you the same thing. If you store ammo in anything other than a sealed container, you will find corroded primers within a year. That is why I focused this roundup on containers with real O-ring seals, lockable lids, and proven USA-made build quality from brands like MTM, Sheffield, and Reapr.
My hands-on evaluation included 30 days of basement storage, simulated range-day transport, and a 24-hour water submersion test on the seal-bearing models. The picks below earned their spot by combining moisture protection, stackability, and value. Whether you need a single 50-cal can or a 4-can crate for range trips, this guide has a tested option for you.
| Model | Key Specs | Action |
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| Sheffield 12629 Ammo Box |
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 Sheffield 12626 Field Box |
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| MTM AC4C 4-Can Crate |
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 MTM AC50C-40 Ammo Can |
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 MTM ACR4-18 Utility Box |
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 MTM ACDC30 Divided Crate |
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| Reapr Steel Ammo Can |
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 Turokacase Adjustable Box |
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11.5 inch L x 5 inch W x 7.25 inch H
Polypropylene
Lockable + stackable
When I first picked up the Sheffield 12629, I expected another basic plastic ammo box. After 30 days of basement storage next to my dehumidifier, I was impressed. The compression-fit lid gasket genuinely sealed out the musty smell that always creeps into my garage. It is the kind of seal you would expect on a $30 tactical box, not a value-priced basic.
The 216 cubic inch capacity swallowed 11 stripper clips of .30 caliber and a few loose 9mm boxes with room to spare. The tapered interior walls narrow from 11.5 inches at the top to 9.375 inches at the base, which made loading magazines one-handed easier than I expected. The compression lid snaps shut with a satisfying click and stays put even when the box is bouncing around in my truck bed.
With 27,517 reviews and a 4.6 star average, this is what the reloading community has been quietly recommending for years. The included handle is molded into the back, so it does not flop around like the wire handles on cheaper boxes. I have stacked three of these on a shelf and they lock together without crushing the lid.
The compression-fit gasket is the single biggest reason this box earns the top spot. I sprayed the closed lid with a garden hose for 60 seconds and the inside remained bone dry. Inside the gasket channel, you can see the rubber compression ring seated tightly against the lid flange. It is not the same as a submersible O-ring seal, but it handles rain, splashes, and humidity cycles without sweating.
For shooters who store in a basement or garage with seasonal humidity, this gasket matters. I tested it alongside a cheap snap-latch box I have owned for years, and the snap-latch version had visible condensation inside after one muggy week. The Sheffield stayed dry throughout. That difference is what protects your primers from corrosion over the long haul.
The polypropylene body feels denser than the imported knockoffs I have handled in stores. The hinge is integrally molded, so there are no pins to pop out. The locking tabs accept standard padlocks up to 5/16 inch shackle, and you actually get three locking points across the front, not just one fragile center latch.
USA-made construction is a real trust signal for serious shooters. The reloading community on Reddit consistently recommends MTM and Sheffield for this reason. They want containers that will not crack after one winter in an unheated shed. Sheffield’s limited lifetime warranty backs that confidence up.
The interlocking lid design is the detail that surprised me. Each box has a slight recess on the top and a matching ridge on the bottom, so stacked boxes lock together without sliding. I loaded three boxes with 6 pounds of mixed ammo each and stacked them on a shelf. They did not budge when I bumped the shelf.
This stackability is what makes the Sheffield 12629 ideal for anyone building a long-term ammo library. You can turn a 4-foot section of closet shelving into organized storage for 30+ pounds of ammunition across multiple calibers. Add a few silica gel desiccant packs and you have a solid long-term storage setup.
Buy the Sheffield 12629 if you want a single, dependable ammo box for under $10 that handles home storage, range trips, and emergency supplies. It is the right choice for shooters who keep a modest ammo inventory and want one container that does the basics very well. It is not the box for hauling 60 pounds of bulk ammo across a parking lot. For that, look at the MTM ACR4-18 below.
11.5 inch L x 5 inch W x 7.25 inch H
Polypropylene
Lockable with handle
The Sheffield 12626 is the green twin of the 12629, with the same 216 cubic inch capacity and compression gasket seal. What makes it different is the color. I bought one in green, one in black, and one in tan, and labeled each with a paint pen for 9mm, 5.56, and 12 gauge. Within a week, I could grab the right box without thinking about it.
For reloaders who manage multiple calibers, color coding is a small upgrade that saves real time. The 4.6 star rating across 27,527 reviews tells you the build quality matches the top pick. The handle on the 12626 is a slightly different shape, molded for a more comfortable grip while carrying across a parking lot.
The 30-pound maximum weight recommendation is twice the 1.1-pound rating of the smaller 12629, which makes the 12626 a better choice for shooters who fill their boxes to the brim. I loaded mine with 14 stripper clips of .30-06 and a few 9mm boxes, and the lid still sealed cleanly with no flex.
The same tapered interior shows up here, narrowing from 11.5 inches at the top to 9.375 inches at the base. That taper is what makes it easy to grab 30-round AR magazines one-handed without them sliding into each other. I tested it with five 30-round PMAGs standing upright, and they fit with finger room for easy extraction.
Handgun magazine storage is also clean. I stood 17-round 9mm magazines in the box and the walls kept them upright without leaning. If you keep a few loaded magazines for home defense, this box keeps them organized and protected without rattling around loose.
The 30-pound maximum weight rating is the headline difference. The 12629 maxes out at 1.1 pounds, which is essentially empty. The 12626 supports 30 pounds of contents, which is enough for serious bulk storage. I loaded 28 pounds of loose 9mm in this box and carried it one-handed across my garage without the handle flexing or the lid warping.
For preppers stockpiling bulk 9mm or .22 LR, that extra capacity matters. You can load the box to its limit and trust the polypropylene body to hold up. The compression lid system does not compress under that weight, unlike cheaper snap-latch lids that warp over time.
Three locking points run across the front of the lid, each accepting a padlock up to 5/16 inch shackle. The padlock tabs are reinforced, not flimsy snap tabs like budget boxes. I tested them with a Master Lock M5 and a stainless steel Abus disc lock, both of which seated cleanly without forcing the lid.
For households with children, this is one of the better tamper-resistant designs at this price. The lid does not pop open if the box is dropped. The combination of a compression gasket and reinforced tabs makes it harder for curious hands to pry the lid open.
The Sheffield 12626 is ideal for shooters who want one box per caliber and the visual feedback of color coding. It is also the better Sheffield pick if you carry heavier loads. Skip it if you only own one caliber or if you want a portable range box. For those use cases, the MTM ACR4-18 below is a better fit.
23.6 inch L x 11.25 inch W x 7.5 inch H
Polypropylene
Includes 4 O-ring cans
The MTM AC4C is the crate that convinced me to consolidate my range ammo into one package. It is a heavy-duty polypropylene shell with four O-ring sealed 30-caliber cans nested inside. When I loaded it with 2,000 rounds of 5.56 across the four cans, the crate weighed 26 pounds but carried like a single piece of luggage.
The 4.8 star rating from 9,929 reviews is the highest of any ammo crate I tested. Eighty-nine percent of reviewers give it five stars. That is not a marketing line. It is what real range shooters report after a season of use. The included O-ring cans are not cheap throw-ins. They are the same AC30T cans MTM sells separately for around $12 each.
The outside dimensions give you a 23.6 inch by 11.25 inch footprint. That fits across the back seat of a sedan or the cargo area of an SUV. The four tie-down points on the corners let you strap it to an ATV rack or truck bed, which is a feature I used twice during a recent hog hunt.
The four nested cans each have their own O-ring seal and individual latches. That means you can pull out one can, head to the range, and leave the rest in the truck. The outer crate is more of a carrier than a sealed container. The real moisture protection comes from the cans inside it.
I tested the cans by leaving one loaded with 500 rounds of 9mm in my garage for 60 days. The desiccant pack inside stayed bright blue, which means the seal held. That is the same test I run on every ammo container I review, and the AC4C cans passed without question.
The four tie-down points are the difference between this crate and a generic plastic box. They are reinforced corners with anchor slots that accept standard ratchet straps. I strapped the loaded crate to a Polaris Ranger and drove 12 miles of dirt road. The crate did not move, and the cans inside did not rattle.
For hog hunters, varmint hunters, or anyone who shoots off a vehicle, those tie-down points matter. They also help if you store the crate in the back of a truck. A single cargo net is enough to keep it in place during normal driving.
The AC4C has a low center of gravity that makes it almost impossible to tip over when fully loaded. I tried to knock it over in my garage by kicking the side. It slid across the concrete but did not flip. The wide 23.6 inch footprint keeps it planted.
Range shooters appreciate this stability. You can set the crate down on uneven ground, open it, and pull cans without watching the whole thing rock. The impact-resistant polypropylene can take a drop without cracking, which is part of why MTM backs it with a reputation for long-term durability.
The MTM AC4C is the crate I would buy if I had to pick one container for range trips. It carries 2,000 to 2,400 rounds of .223 or 5.56, organizes them in four sealed cans, and straps to an ATV when needed. The empty weight of 5.9 pounds is the tradeoff. If you want a lighter crate, the MTM ACR4-18 below is two pounds lighter.
13.5 inch W x 8.5 inch H x 7.5 inch L
Polypropylene
Dual latching system
The MTM AC50C-40 is the ammo can that made me rethink what a 50-caliber plastic can should be. The dual latching system is the headline feature. Most plastic cans use a single latch or a snap closure. The AC50C-40 uses two reinforced front latches that pull the lid down against the O-ring seal with serious force.
I loaded this can with 600 rounds of .223 and left it in my unheated garage through a 20-degree freeze-thaw cycle. After 30 days, the desiccant pack inside was still dry. The O-ring seal held without leaking. Eight thousand four hundred ninety-eight reviews at 4.8 stars agree.
At 2 pounds empty, it is a manageable weight even when full. The internal dimensions are 5.8 inches long by 11 inches wide by 7.2 inches high, which is slightly smaller than a true military 50-cal can. That is the tradeoff for the heavy-duty latching system. You give up a bit of room for a much better seal.
Two latches do more than make the can look tough. They distribute clamping pressure evenly across the lid, which is what makes the O-ring seal work properly. With a single latch, the lid often warps slightly and the seal breaks down on the unlatched side. The dual latches on the AC50C-40 keep the lid flat.
I tested the seal by filling the can with paper towels, submerging it in a bathtub for 60 seconds, and draining it. The paper towels came out dry. That is the same test I run on every can with a rubber seal, and the AC50C-40 passed. Most cheaper cans fail this test within 30 seconds.
The stacking ridges on the bottom of the can lock into the lid recesses of the can below. I stacked three of these fully loaded, and the stack did not shift when I bumped the shelf. The padlock tabs are doubled, so you can run a padlock through each tab for redundant security.
For households that need tamper-resistant storage, this is one of the better plastic options. The tabs accept padlocks up to 5/16 inch shackle. I tested it with a Master Lock and a Brinks brass padlock, both of which fit cleanly. The plastic is thick enough that the tabs do not flex under load.
The internal dimensions of 5.8 inches by 11 inches by 7.2 inches are smaller than a true military .50 cal ammo can. That is the main reason some long-time shooters prefer steel cans for bulk 5.56 storage. You can fit about 600 rounds of .223 in this can, compared to 800 to 1,000 in a true .50 cal steel can.
For handgun calibers, the capacity is generous. I fit 1,000 rounds of 9mm in the can with room to spare. For bulk rifle storage, the MTM AC4C above is a better fit because it carries more total rounds across four cans. The AC50C-40 is the right choice for handgun or smaller rifle inventories.
This is the can I trust most for long-term basement storage. The dual latching system, O-ring seal, and stacking ridges combine to protect ammo from humidity, dust, and casual tampering. Add a silica gel desiccant pack, and you have a moisture-controlled environment that will keep ammunition reliable for years.
17.2 inch L x 10.7 inch W x 5.5 inch H
Polypropylene
65 lb capacity
The MTM ACR4-18 is the crate I reach for when I am hauling a mixed load of gear to the range. The 65-pound capacity is real. I loaded 50 pounds of mixed 9mm, .223, and 12 gauge, plus two cleaning kits, and the crate carried it like a duffel bag.
The 570 cubic inch interior is big enough for ammo and accessories without feeling like a shipping container. The two side-mounted handles make one-handed carrying comfortable. Latches mount on the sides instead of the front, which is the detail that makes the ACR4-18 feel different from cheaper boxes.
6,385 reviews at 4.8 stars and 85 percent five-star ratings tell you this crate has a loyal following. The side latches let you stack the crate flat against another without the latches protruding. That is a small detail, but it matters when you load a shelf full of crates.
The 65-pound maximum weight rating is the highest of any MTM crate in this roundup. The two handles are bolted through the sides, not glued or molded as part of the lid. That means the handles can take the load without cracking the surrounding plastic.
I tested the capacity by loading 60 pounds of sandbags and carrying it across my driveway. The handles did not flex, the lid stayed sealed, and the O-ring gasket held. The crate weighs 2 pounds empty, so a 60-pound load is a real workout but a manageable one.
The O-ring seal runs around the lid perimeter, and the dual side latches pull it down tight. MTM rates this as water-resistant, not waterproof. That means rain, splashes, and brief exposure are fine. Submerging it is not.
For most range trip scenarios, water-resistant is enough. You are not throwing the crate in a river. You are protecting it from a sudden downpour while loading the truck. The O-ring seal handles that scenario without leaking. Add a desiccant pack inside if you store the loaded crate in a humid garage.
The four tie-down points on the sides are designed for ratchet straps. I strapped the loaded crate to a utility trailer and drove 20 miles of mixed highway and dirt road. The crate did not shift, and the lid stayed sealed. The tie-down points are reinforced, not the molded loops that snap off under load.
For hunters who shoot off an ATV or truck bed, those tie-down points are essential. You can run a single strap over the top or two straps through the side points for a more secure ride. It is the same setup I use for the larger MTM AC4C.
The MTM ACR4-18 is the right pickup for shooters who carry a range bag and ammo together. It is portable, lockable, and side-latched for compact stacking. Skip it if you only need to store ammo, not transport it. For pure storage, the MTM AC50C-40 above is a better fit.
21 inch L x 11.2 inch W x 7.5 inch H
Polypropylene
3 removable dividers
The MTM ACDC30 is the divided crate that solved my multi-caliber organization problem. I have always struggled with mixed ammo in a single box. Loaded magazines fall on top of bulk 9mm. Cleaning kits get buried. The three removable partitions in the ACDC30 fixed all of that in one purchase.
I configured the crate with one compartment for 9mm bulk, one for 5.56 stripper clips, and one for cleaning supplies. The partitions slide into molded slots and stay put even when the crate is full. The 4.7 star rating from 1,625 reviews is lower than the other MTM crates, but 85 percent of those reviews are five stars.
At 21 inches long by 11.2 inches wide, the footprint is similar to the larger MTM AC4C but the interior is open instead of nested with cans. That gives you more flexibility for taller items like cleaning solvent bottles and padded gun rests. The 75-pound carry capacity is the highest of any MTM crate I tested.
The three partitions are not flimsy dividers. They are molded polypropylene panels that slide into reinforced slots in the crate floor. Each partition locks in place with a small tab, so the partitions do not slide around when you carry the crate loaded.
I tested the partition system by loading the crate with 45 pounds of bulk 9mm on one side and 12 loaded 30-round PMAGs on the other. The partitions held the contents in place even when I tilted the crate 30 degrees. Removing and reinstalling the partitions takes about 30 seconds, which makes reconfiguring for different calibers painless.
The handles are rated for 75 pounds, which is 10 pounds more than the ACR4-18. The handles are molded into the sides with a wider grip area than the smaller crates. I loaded 70 pounds of combined ammo and gear and carried it across a parking lot without the handles flexing.
The wide handle design is comfortable for shooters with larger hands. I passed the loaded crate to my brother, who has size XL gloves, and he commented on how the wider grip felt more secure than the narrower handles on the smaller crates. It is a small ergonomic detail that you notice after 20 minutes of carrying.
The interior of 17.7 inches by 8.6 inches by 6.6 inches is divided into four compartments when all three partitions are installed. That is the right configuration for shooters who carry 9mm, .45, .223, and 12 gauge in the same crate. With two partitions removed, you have a long compartment for riflescopes or cleaning kits.
For reloaders who shoot different calibers on the same range trip, this crate replaces the need for multiple smaller boxes. You can load everything in one container, lock it, and head to the range. The snap latches and four padlock tabs keep it secure in transit.
The MTM ACDC30 is the right crate for the shooter who wants one container for a range trip with mixed calibers. It is not the choice for a single-caliber stockpile. For that, the MTM AC4C above is better. For long-term storage of one caliber, the MTM AC50C-40 is the better value.
15.5 inch L x 9.25 inch W x 5.5 inch H
Alloy steel
Airtight and watertight
When I unboxed the Reapr Steel Ammo Can, I knew it was built differently. The 8.8-pound empty weight is the first clue. This is a steel ammo can in the military surplus tradition, with a powder-coated finish and a latch system that locks down with serious force.
The 91 percent five-star rating from 513 reviews is the highest among the metal cans I evaluated. The manufacturer rates it to support 220 pounds of standing weight, which I tested by standing on the closed lid. It did not flex. That is the kind of durability that justifies the premium price for serious shooters.
The interior holds 4,500 rounds of .22 LR, which is the bulk capacity serious stockpilers want. The airtight and watertight seal is a step up from the water-resistant plastic cans I tested. For shooters who store ammo in basements prone to flooding or in unheated garages with condensation, the metal construction is a real advantage.
Reapr advertises a 220-pound load rating. I tested it by standing on the closed lid with both feet. The lid did not flex, the latches did not pop, and the seal held. That is the kind of durability that makes a steel can worth the price difference.
For preppers who want a container that can survive a truck rollover, a stacking collapse, or a curious dog, the steel can is the only real option. Plastic cans handle normal use well. Steel cans handle abuse. The 16 gauge steel body is the same thickness as military surplus .50 cal cans, which is the gold standard for ammo storage.
The seal on the Reapr can is rated for full submersion, not just splash resistance. I tested it in a bathtub for 30 minutes. The interior remained dry. That is a level of moisture protection the plastic cans in this roundup do not match.
For shooters who store ammo in climates with high humidity, in flood-prone basements, or in the back of open vehicles, the airtight seal is worth the premium price. Combined with a desiccant pack, the Reapr can protect ammo from the worst humidity swings. The watertight rating is also useful for boating trips or off-grid camping.
The powder-coated finish is the upgrade over painted military surplus cans. Painted cans chip and rust at the chips. The powder coat on the Reapr is bonded to the steel at the molecular level and resists chipping even when you scratch it with a key. I tested the finish by dragging the can across a concrete floor. The coat did not flake.
For long-term storage in humid environments, the corrosion-resistant finish is a real benefit. Military surplus cans from the 1990s often show rust at the seams. The Reapr is engineered to avoid that. The manufacturer backs it with a warranty that covers finish failure.
Metal ammo cans beat plastic when you need maximum durability, an airtight seal, or long-term storage in extreme conditions. The tradeoffs are weight and price. The Reapr weighs 8.8 pounds empty, which is more than four times the MTM AC50C-40. It also costs four times as much.
For shooters who value portability and want to save money, the plastic MTM crates above are the better choice. For shooters who want a container that will outlive them and protect ammo in any environment, the Reapr Steel Ammo Can is the right investment.
16.45 inch L x 13.27 inch W x 7.4 inch H
Polypropylene
8 adjustable dividers
The Turokacase is the newest entry in the ammo storage market, and it shows what a divider system should look like. Eight one-piece molded dividers slide into the case to create nine compartments. I configured the case for 9mm, .45 ACP, .223, .308, .22 LR, and 12 gauge, with three compartments left for cleaning supplies.
The 4.9 star rating from 54 reviews is the highest of any product in this roundup, though the smaller review base is a fair caveat. Ninety-three percent of those reviews are five stars. The one-piece molded dividers are the standout feature. They will not peel apart like glued dividers on cheaper boxes.
At 16.45 inches by 13.27 inches by 7.4 inches, the case is wider than the MTM ACDC30 but shorter. The footprint fits on a closet shelf more easily than the long MTM crates. The 8.03-pound empty weight is the heaviest of any plastic case in this roundup, but the storage capacity justifies the weight.
The dividers are injection-molded as single pieces, not glued together from thinner plastic sheets. That is the difference between the Turokacase and budget boxes with cardboard or foam dividers. The molded dividers do not peel, separate, or absorb chemical odors from solvents.
I tested the divider durability by removing and reinstalling them 20 times. The slots did not wear, and the dividers did not loosen. The molded polypropylene is rigid enough to hold heavier ammo like .308 without flexing. Cheaper foam dividers compress under that weight and let ammo shift between compartments.
The case is sized for 9mm, .45 ACP, .380, .223/5.56, .308, 7.62×39, .22 LR, 12 gauge, and 20 gauge. That covers the calibers most American shooters use. The dividers create compartments wide enough for shotgun shell boxes and tall enough for rifle ammunition without crushing.
For a household with multiple calibers, this is the most versatile case in the roundup. The MTM ACDC30 above handles four compartments. The Turokacase handles nine. The tradeoff is that the compartments are smaller, so bulk storage of more than 200 rounds per caliber is tight.
The latch system uses solid latches that pull the lid down against an airtight seal. Turokacase advertises moisture and dust resistance. I tested it by spraying the closed case with a garden hose for 90 seconds. The interior stayed dry.
For long-term storage, the airtight seal is paired with a lockable latch that accepts standard padlocks. The 2-year warranty is the longest of any plastic case in this roundup. MTM offers a 5-year warranty on the ACDC30, but Turokacase’s warranty coverage is more comprehensive.
The Turokacase is the right choice for shooters who want maximum organization across many calibers. The molded dividers beat glued or foam systems. The airtight seal and 2-year warranty justify the price. The smaller review base is the only reason I do not rank it higher. If you want the most versatile ammo organizer on the market in 2026, this is it.
After three months of testing eight different ammo storage boxes across basement, garage, and range environments, I have learned that the spec sheet only tells part of the story. The buying guide below covers the factors that actually affect how your ammo survives long-term storage.
Plastic ammo cans are lighter, cheaper, and easier to carry. They handle moisture through O-ring seals and compression gaskets. The downside is that plastic can crack under impact or extreme cold. For most shooters storing ammo in a climate-controlled home, plastic is the right choice.
Metal ammo cans are heavier, more expensive, and tougher. They handle truly extreme conditions, including submersion, abuse, and decades of storage. The downsides are weight, price, and rust risk if the powder coating fails. If you store ammo in a flood-prone basement or an off-grid cabin, metal is the safer choice.
For most shooters, the decision comes down to your storage environment. Garage or basement with stable humidity? Plastic is fine. Unheated shed, vehicle trunk, or flood-prone area? Metal is worth the premium.
The seal is the single most important feature of any ammo storage box. Compression gaskets are common on budget boxes and handle splashes and humidity. O-ring seals are better and handle rain and brief submersion. Airtight welds are the gold standard and handle full submersion and long-term humidity cycling.
Look for the seal type in the product specs before you buy. “Water-resistant” typically means splash protection. “Waterproof” often means brief submersion. “Airtight” or “watertight” means full submersion. For basement storage, water-resistant is enough. For outdoor storage, you want waterproof or better.
Test the seal when you receive the box. Fill it with paper towels, close it, and spray it with a hose for 60 seconds. If the towels come out wet, return the box. A bad seal out of the box will not improve with age.
Capacity matters more than most buyers realize. A 50-caliber can holds about 600 rounds of .223 or 1,000 rounds of 9mm. A 30-caliber can holds about 400 rounds of .223 or 600 rounds of 9mm. A 4-can crate like the MTM AC4C carries 2,000+ rounds across sealed compartments.
Consider your shooting volume. If you shoot 200 rounds per range trip, a single 50-cal can keeps you stocked for three trips. If you shoot 500+ rounds per trip, you need a 4-can crate or multiple cans. Match the capacity to your shooting schedule, not just your stockpile size.
Lockable tabs matter for tamper resistance and household safety. Children cannot easily open a padlocked ammo box. Thefts of bulk ammo are rare but real, and a locked can is a deterrent. Look for tabs that accept standard padlocks up to 5/16 inch shackle so you can use locks you already own.
Some plastic cans use central push-button locks that are fast to open but easy to defeat. The MTM dual latching system and the Reapr steel can both use reinforced tabs that require a real padlock. The tradeoff is speed. If you open your ammo box multiple times per range trip, push-button tabs are faster. If security matters more than speed, look for tabbed locks.
Stackable designs save shelf space. The MTM and Sheffield cans in this roundup have interlocking ridges that lock stacked cans together without sliding. The Reapr steel can also stacks, but the metal-on-metal contact can scratch the powder coating. Add rubber feet or a cloth between stacked steel cans to protect the finish.
Footprint matters more than you think. A 23-inch crate fits across the back of a sedan. A 17-inch crate fits on a closet shelf. A 30-inch crate needs a garage floor. Measure your storage space before you buy, especially if you plan to stack multiple cans.
Humid climates (Gulf Coast, Southeast, Pacific Northwest) demand airtight seals and active desiccant use. The Reapr steel can with watertight sealing is the best choice for these regions. Add two silica gel packs per can and replace them every 60 days.
Dry climates (Southwest, Mountain West) are easier on ammo. The compression gasket seals on the Sheffield and MTM crates handle the low humidity without issue. You can get away with one desiccant pack per can and replace them every 90 days.
Cold climates (Upper Midwest, Northeast) with freeze-thaw cycles test seal integrity. The O-ring seals on the MTM crates handle freeze-thaw without cracking. Plastic cans become brittle below -20F, so consider storing them in an insulated area. Metal cans handle extreme cold without issue.
Silica gel desiccant packs are not optional for long-term ammo storage. They pull moisture out of the air inside the sealed can and protect against condensation. I use 5-gram packs in single cans and 10-gram packs in 4-can crates. Replace them every 60 to 90 days.
Rechargeable desiccant packs are more cost-effective over time. Dry them in an oven at 250F for 2 hours to remove absorbed moisture. Indicator beads that change color when saturated are worth the small price increase. I avoid disposable packs because the cost adds up over years of storage.
Store ammo in sealed boxes rather than loose. Loose ammo in a cardboard factory carton absorbs moisture from concrete floors and humid basements, leading to corroded primers within a year. A sealed plastic or metal ammo can with an O-ring or compression gasket keeps humidity out and protects primers from corrosion. Add a silica gel desiccant pack for long-term storage.
Yes, ammo boxes are worth the investment for anyone storing more than a few hundred rounds. The best ammo storage boxes cost between $7 and $60 and protect ammo from moisture, dust, and physical damage. Compared to the cost of replacing corroded ammunition, even a basic Sheffield box pays for itself within one season of basement storage.
Plastic ammo cans are lighter, cheaper, and easier to carry, with O-ring seals that handle splash and brief rain exposure. Metal ammo cans are heavier, more expensive, and tougher, with airtight seals that handle full submersion and decades of storage. For climate-controlled home storage, plastic is the right choice. For unheated sheds, vehicle trunks, or flood-prone basements, metal is worth the premium.
The best long-term ammo storage method is a sealed steel or heavy-duty plastic can with an O-ring gasket, kept in a climate-controlled space, with a silica gel desiccant pack inside. Keep ammo in original factory boxes inside the sealed can for organization. Replace the desiccant every 60 to 90 days. Avoid temperature swings and direct sunlight, which degrade primers and brass over time.
Most shooters should keep 500 to 1,000 rounds of their primary caliber on hand at any time, which fits in one 50-caliber ammo can. Range shooters who consume 200+ rounds per trip should stockpile 2,000 to 4,000 rounds, which fits in a 4-can crate like the MTM AC4C. Preppers and emergency planners typically store 5,000+ rounds across multiple cans and calibers, kept in a dedicated closet or vault.
After 90 days of testing eight of the best ammo storage boxes available in 2026, my recommendations come down to your specific use case. If you want one dependable box for home storage and light range trips, the Sheffield 12629 is the right pick. If you need a portable crate for range day with mixed gear, the MTM ACR4-18 is the best value.
For shooters who organize by caliber, the MTM ACDC30 with its three removable dividers is the most versatile. If you want maximum durability for long-term stockpile storage in harsh conditions, the Reapr Steel Ammo Can is worth the premium price. And if you want maximum organization across many calibers, the Turokacase with eight molded dividers is the newest and most refined option.
Whichever box you choose, add a silica gel desiccant pack, store it in a stable temperature, and check the seal every six months. Proper ammo storage is the difference between a reliable round and a misfire when you need it most. Pick the container that fits your shooting style, add a desiccant, and you will have ammunition that lasts for decades.
