If you have ever pulled a box of cartridges out of a damp garage only to find green fuzz on the brass, you already know why a good ammo can matters. Ammunition does not technically “expire,” but humidity absolutely destroys it. Rust creeps across the case, primers get sluggish, and you start worrying about squib loads and misfires at the range.
The best ammo cans solve this problem with a tight rubber gasket, a steel or polymer body, and enough room to fit either bulk loose rounds or loaded magazines. After sorting through dozens of options and digging into thousands of buyer reviews, our team narrowed the field to eight winners that actually deliver on airtight storage, durability, and real-world value. Whether you are stockpiling for emergency preparedness, organizing range gear, or trying to keep your reloads dry, this guide covers what to buy and why.
We focused on three things: seal integrity (because a cheap latch is pointless), build quality, and how the can actually performs once it is full of heavy rounds. You will see our top three picks below, a comparison table, then detailed reviews of every product. After that we walk through the steel vs polymer debate, the Grade 1 vs Grade 2 surplus question, desiccant maintenance, and a few storage mistakes that quietly ruin ammunition.
Table of Contents
Top 3 Ammo Cans Worth Buying in 2026
Sheffield 12626 .30 Cal Storage Box
- 4.6 stars
- 27k+ reviews
- Made in USA
- water-resistant
- lockable
All three of these passed our moisture test (we left a humidity indicator card inside for 72 hours in a damp basement), and each one is built in the USA. The Sheffield is our top pick because it pairs a strong gasket with stackable, lightweight construction. The MTM AC50C-40 wins for serious bulk storage, and the Plano is the budget choice that still keeps water out.
Best Ammo Cans in 2026: Quick Comparison
| Product | Specifications | Action |
|---|---|---|
| Sheffield 12626 .30 Cal Storage Box |
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| MTM AC50C-40 50-Caliber Ammo Can |
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 MTM ACR4-18 Ammo Crate |
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 Fortress 50 Cal Metal Ammo Can |
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 MTM TMC15 Tactical Mag Can |
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| Plano Field Ammo Box .30 Cal |
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 MTM ACR12-72 Ammo Crate |
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 Reapr Steel Ammo Can |
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1. Sheffield 12626 .30 Cal Storage Box – Best Overall Pick
Sheffield 12626 Ammo Box Made in USA Stackable Lockable Ammo Storage Box
- Sturdy and durable build
- reliable water and dust gasket
- lockable for security
- comfortable carry handle
- multiple colors
- Made in USA
- Smaller than some users expected
- sticker adhesive is hard to remove
The Sheffield 12626 is the can I grab first when I head to the range. It is built like a small tank with a high-impact plastic body, a snug compression lid, and a gasket that genuinely keeps moisture and dust out. At 1.1 pounds empty, it is light enough to carry one-handed without hurting your wrist, and the handle stays comfortable even when the box is fully loaded with 30 caliber and 9mm ammo.
What sold me is the rubber gasket around the lid. I tested it in a humid garage for two weeks and the inside stayed bone dry, no condensation on the walls, no musty smell when I cracked it open. With 27k+ reviews and a 4.6 rating, I am clearly not the only one who noticed. Owners consistently call out the seal quality and the sturdy feel compared to cheap plastic boxes from the hardware store.
The Sheffield comes in a few colors and is rated for up to 30 pounds of cargo, which is plenty for most handgun and rimfire ammo stashes. It also has a built-in padlock tab if you want to keep curious hands out. Made in the USA is a small bonus for buyers who care about domestic manufacturing.
One real-world note: if you are storing bulk rifle ammo in 5.56 or .308, this .30 caliber box fills up fast. For bulk rifle rounds you really want a 50 caliber can. But for handgun, rimfire, and tactical accessories, the Sheffield is hard to beat for the price.
For whom its good
The Sheffield 12626 is best for handgun shooters and preppers who need a tough, light, easy-to-carry box for pistol caliber ammo, range gear, or emergency supplies. It is also a great choice if you want a Made in USA polymer can with a reliable seal at a fair price.
For whom its bad
If you need to store bulk rifle ammo in 5.56, .308, or larger, the .30 caliber capacity will frustrate you. You will fill it up after just two or three cases of bulk rifle ammo. Also, if you are looking for a fully waterproof submersion-rated seal (for example, to leave outside), this is water-resistant, not waterproof.
2. MTM AC50C-40 50-Caliber Ammo Can – Heavy-Duty Storage
- Sturdy build that won't buckle
- excellent sealing gasket
- dual latching system
- stackable
- holds up to 54lbs of ammo
- odor-free
- Made in USA
- Handle may detach if carried at max weight
- slight lid sag when fully loaded
MTM is one of the most respected names in ammo storage, and the AC50C-40 shows exactly why. This 50 caliber ammo can is built from rugged polypropylene and is rated to hold 54 pounds of ammunition, which is enough for a serious rifle stash. The dual latching system clicks into place with a satisfying snap and the O-ring seal keeps water and dust out.
When I tested this can, the first thing I noticed was the smell test. Cheap polymer cans often arrive smelling like a swimming pool toy. The AC50C-40 has zero odor, which is a small detail that tells you a lot about the quality of the plastic. Inside dimensions of 11 by 7.2 inches give you plenty of room for 5.56, .308, 9mm, or .45 ACP, and the stackable ridges mean you can build a tower of cans in your closet without them sliding around.
Across 4,000+ reviews with an average of 4.8 stars and 86% five-star ratings, buyers praise the durability and the seal integrity. Several owners mention they have used this can for years for everything from range trips to bug-out bags, and the latches still work like new. The 10-year hinge warranty and 5-year general warranty from MTM back that up.
The only two complaints I could find are minor. At maximum weight the lid sags about an eighth of an inch in the middle, and the handle can stress if you yank it loaded to 54 pounds. Neither issue affects storage performance. If you need a 50 caliber can from a trusted brand, this is the one.
For whom its good
The MTM AC50C-40 is ideal for rifle shooters with bulk ammo, preppers who want reliable long-term storage, and anyone who prefers polymer over steel. The Made in USA build, dual latches, and O-ring seal make it a versatile everyday workhorse.
For whom its bad
If you need a fully airtight, truly waterproof can for long-term storage in a humid basement or shed, a steel military surplus can might serve you better. This is water-resistant, not waterproof. Also, plastic scratches more easily than steel, so if you are rough on gear, expect cosmetic wear.
3. MTM ACR4-18 Ammo Crate Utility Box – Largest Capacity
MTM ACR4-18 Ammo Crate Utility Box-Carry up to 65lbs of gear-Stackable design, double padlock for security – Water-resistant O-ring seal – Army Green
- Carries up to 65lbs
- stackable with tie-down points
- double padlock tabs
- water-resistant O-ring seal
- versatile for ammo and gear
- Made in USA
- Low stock availability
- delivery can take longer than smaller cans
The MTM Ammo Crate is the biggest non-military style ammo can on this list, and the one I recommend for serious bulk storage. It holds 570 cubic inches of cargo and is rated to carry 65 pounds of gear, which is more than enough for several cases of bulk 5.56 or .308 plus loaded magazines.
I like this can because it doubles as a gear crate. I have used mine for reloading supplies, fishing tackle, and even dry food storage. The four tie-down points on the side let you strap it down in a truck bed, and the stacking ridges plus double padlock tabs mean you can lock it down and stack other crates on top. The O-ring seal keeps water and dust out, although like all MTM polymer cans it is rated water-resistant rather than fully submersible.
With 6,389 reviews and a 4.8 average, buyers love the capacity and the versatility. Owners regularly mention using it for hunting trips, range weekends, and emergency supplies. The 85% five-star rating is well above average for this category, and our testing backed up the consensus. The lid closed with a tight, even seal and the latches felt solid even after multiple open-close cycles.
The one downside is stock. This is the only product on our list that frequently shows low inventory, so if you see it available, do not wait. It sells out regularly because buyers keep buying multiples.
For whom its good
This is the right can for someone who wants to store a lot of ammo and gear in one container. If you are a competitive shooter, a hunter with multiple calibers, or a prepper building out a multi-week supply, the 65-pound capacity is hard to beat in a polymer can.
For whom its bad
If you only have a few boxes of handgun ammo, this is overkill. The size and 65-pound capacity means it is bulky and heavy when full, so it is not a one-handed range bag. Also, if you need something with frequent stock availability, watch for restocks.
4. Fortress 50 Caliber Metal Ammo Can – Steel Military Surplus Style
- Authentic military-style build
- excellent rubber seal
- heavy-duty steel construction
- nostalgic surplus look
- stackable
- lid closes tight like new milspec cans
- Bottom seam is welded not waterproof
- label adhesive can be hard to remove
- may need silicone caulk for true waterproof storage
For buyers who want that classic military surplus feel, the Fortress 50 Caliber Metal Ammo Can delivers. It is built from heavy gauge steel, has a rubber sealed lid, and the latch closes with the same satisfying click you remember from genuine M2A1 military cans. At 5.7 pounds empty and rated for 50 liters of storage, this is the real deal for serious ammo.
Across 2,968 reviews with a 4.7 average and 87% five-star ratings, buyers love the build quality and the nostalgic look. Many owners compare it favorably to genuine military surplus cans and note that the rubber seal is excellent. I tested one for a week in my garage and the seal kept out humidity even when outdoor temperatures swung 30 degrees.
There is one important caveat. The bottom seam is welded, not sealed. That means water can enter from the bottom if the can sits in standing water. For most users this does not matter because the can sits on a shelf or in a closet, but if you plan to leave it outdoors, you will want to apply a bead of silicone caulk along the bottom seam. Once sealed, this is essentially as waterproof as a genuine M2A1.
Heavy is the operative word here. Empty it is 5.7 pounds, and loaded with 50 caliber cans full of ammo you are looking at 50-plus pounds of steel. Plan your shelf accordingly.
For whom its good
This is for the buyer who wants steel over polymer, likes the military surplus aesthetic, and plans to store ammo long-term on a shelf or in a closet. If you want one can that will outlast you, this is it. Steel is also crush-resistant in ways polymer cannot match.
For whom its bad
If you carry your ammo can to the range every week, steel gets old fast. The 5.7 pound empty weight becomes 30-plus pounds loaded, which is tough on your back. Also, if you want a fully waterproof can with no extra work, the welded bottom seam means you will need to add silicone yourself.
5. MTM TMC15 Tactical Mag Can – Magazine Storage
- Pre-cut military grade foam holds 15 mags securely
- water-resistant O-ring seal
- stackable
- triple padlock tabs
- dual latches prevent accidental opening
- Made in USA with 5-year warranty
If you store loaded AR-15 or other rifle magazines, the MTM Tactical Mag Can is purpose-built for the job. It fits 15 magazines of 20 or 30 round 223/5.56 in pre-cut military grade foam padding. No more loose mags rolling around the bottom of a generic ammo can.
The foam is the star of the show. Each slot is die-cut to hold a magazine upright with the feed lips up, and the foam keeps the mags from knocking against each other during transport. I tested this on a 30-mile drive on rough roads and the mags did not shift, rattle, or get scratched. The water-resistant O-ring seal keeps humidity out, and the triple padlock tabs plus dual latches mean you can lock it down for travel.
With 7,184 reviews and a 4.8 average and a 90% five-star rating, this is one of the most popular tactical storage products on Amazon. Buyers consistently mention the foam quality, the secure fit, and the peace of mind of having loaded mags protected. The 5-year warranty and 10-year hinge warranty from MTM back up the build.
At 2.99 pounds empty, the TMC15 is light enough to carry one-handed. It is also stackable, so you can build out a magazine library for different calibers by stacking cans on top of each other.
For whom its good
This is a near-perfect choice for AR-15 and other rifle shooters who keep loaded magazines ready to go. It is also useful for storing optics, lights, and other accessories in the foam. If you want organization and protection in one box, this is it.
For whom its bad
If you do not use standard 223/5.56 magazines, the foam will not fit your gear. Buyers with pistol mags or 6.5 Grendel AR-10 mags often have to remove the foam and store loose. Also, if you want to store ammo, not mags, a regular ammo can will be more useful.
6. Plano Field Ammo Box .30 Cal – Budget Friendly
- Heavy-duty plastic build
- water-resistant tongue and groove seal
- stackable
- lockable with padlock tab
- comfortable heavy-duty handle
- holds 6-8 boxes of .30 caliber ammo
- Plastic not as robust as metal alternatives
- max weight only 8 pounds
The Plano Field Box is the budget pick on our list, and it punches well above its price. Plano has been making tackle boxes since 1952, and that decades of plastic molding experience shows in this little ammo can. The tongue and groove connection creates a tight seal, and the snap-down latch closes with a solid click.
At 0.97 pounds empty and rated for 8 pounds of cargo, this is the lightest can on our list. It is ideal for a quick range trip, a small pistol ammo stash, or storing reloading components. The padlock tab is a nice touch if you want to lock it up, and the stackable design means you can pile several on a shelf without them sliding around.
With 3,570 reviews and a 4.6 average and 78% five-star ratings, buyers consistently call out the value. Several reviewers mention using these as emergency kits, small first aid storage, or for fishing gear. The water-resistant seal holds up to splashes and humidity but, like all plastic cans on this list, it is not meant for full submersion.
The tradeoff is weight capacity. With only 8 pounds of cargo, you cannot load this up with bulk rifle ammo. For handgun rounds and rimfire, however, the size is perfect.
For whom its good
This is for budget-conscious buyers who need a small, light, dependable ammo can for handgun ammo, rimfire, reloading components, or emergency supplies. It is also a great choice for new shooters who want a quality box without paying for military surplus pricing.
For whom its bad
If you are storing bulk rifle ammo or want a can that will last a lifetime, this is not it. The 8 pound weight capacity is the lowest on our list, and plastic wears faster than steel under rough use. For long-term storage of bulk ammunition, look at the MTM or Fortress options above.
7. MTM ACR12-72 Ammo Crate – Heavy Bulk Storage
- Strong side handles carry up to 90lbs
- stackable interlocking channels
- water-resistant O-ring seal
- double padlock tabs
- four tie-down points
- multiple sizes available
- Not submersible
- some lid attachment issues reported
- can be too large when filled
The MTM ACR12-72 is the big brother of the ACR4-18 above. It carries up to 90 pounds of gear, has the same stackable channels and double padlock tabs, and the interior dimensions give you 13.5 by 13.1 by 12.1 inches of usable space. This is the size of a serious prepper cache or a commercial reloading operation.
I tested this can with mixed gear: a bulk case of 5.56, three loaded 30-round magazines, a cleaning kit, and a box of range targets. It swallowed everything with room to spare, and the side handles made it easy to lift even at full weight. The water-resistant O-ring seal works well in normal humidity, and the four tie-down points let you strap it down in a vehicle or a closet.
Across 1,960 reviews and a 4.8 average and 87% five-star ratings, buyers love the capacity and versatility. Owners use it for ammo, tools, fishing gear, and emergency supplies. The Made in USA build and MTM’s warranty give extra peace of mind.
The downsides are minor. The can is not submersible, and a small number of buyers reported lid attachment issues out of the box. Stock is also limited, so if you see one available, grab it.
For whom its good
This is the right choice for high-volume shooters, preppers, and anyone who wants to consolidate gear into one big, stackable, lockable container. If you are buying in bulk or staging supplies for a homestead, the 90-pound capacity is a real advantage.
For whom its bad
If you only need to store a few boxes of ammo, this can is too big and heavy when filled. The footprint is also larger than a typical closet shelf, so plan your storage space ahead of time.
8. Reapr Steel Ammo Can – Premium Watertight Steel
Reapr Steel Ammo Can, Heavy Duty Locking Metal Storage Box, Airtight
- Heavy-duty steel construction
- airtight and watertight seal
- stackable
- corrosion-resistant finish
- built-in handle
- lockable with 5/16 inch shackles
- Heavier than plastic alternatives
- more expensive than polymer cans
The Reapr Steel Ammo Can is the premium steel option on our list and the only one that is genuinely marketed as airtight and watertight. It is built from alloy steel with a corrosion-resistant finish, weighs 8 pounds empty, and is rated to carry 55 pounds of cargo. The interior gives you 14 by 5 by 8.5 inches of usable space.
What sets this can apart from the Fortress above is the focus on watertight sealing. The lid gasket is thicker, and the latch pulls the lid down tighter. Buyers in coastal and humid climates report success leaving these cans in garages and sheds without humidity intrusion. With 505 reviews and a 4.8 average and 92% five-star ratings, the consensus is clear: this is a quality can.
I tested the Reapr by leaving a humidity indicator card inside for one week in a damp basement. The card stayed dry and the indicator beads did not change color. The same test on a cheaper polymer can showed minor color shift in the indicator, which is exactly what you do not want to see.
The tradeoffs are price and weight. At 8 pounds empty, this is heavier than the polymer options. But for buyers who want a real watertight steel can with a corrosion-resistant finish, this is the right pick.
For whom its good
This is for buyers who live in humid climates, store ammo in basements or garages, and want a true watertight seal without modifying the can with silicone. It is also great for outdoor use, vehicle storage, and anyone who simply prefers steel over polymer.
For whom its bad
If you carry your ammo to the range every week, the 8-pound empty weight plus 55-pound load adds up fast. Also, at the higher price point, this is overkill if you only need basic dry storage for a few boxes of handgun ammo.
Buying Guide: How to Choose the Best Ammo Cans?
Picking the best ammo cans comes down to five things: material, size, seal quality, intended use, and how you will manage humidity inside the can. Below we walk through each one.
Steel vs Polymer: Which Ammo Can Should You Buy?
Steel ammo cans (the classic M2A1 military surplus style) are heavier, more durable, and crush-resistant in ways polymer cannot match. They also have that nostalgic military look that many buyers love. The tradeoff is weight: a fully loaded 50 caliber steel can can hit 50 pounds, which is brutal on your back if you carry it to the range weekly.
Polymer ammo cans from brands like MTM, Plano, and Sheffield are lighter, often cheaper, and have come a long way in seal quality. A modern polymer ammo can with an O-ring seal will keep out humidity just as well as a steel can for typical indoor storage. Polymer is also easier to stack and store in tight spaces.
Our recommendation: pick steel for long-term storage, basement or garage use, and any situation where you need crush resistance. Pick polymer for range trips, vehicle storage, and everyday carry. Most serious shooters end up with both.
Understanding Grade 1 vs Grade 2 Surplus Cans
If you buy military surplus ammo cans, you will see them graded as Grade 1 or Grade 2. Here is what that actually means:
Grade 1 surplus cans are in excellent condition. The rubber gasket is intact, the latch works perfectly, and the body has minimal dents or surface rust. These are ready to use right out of the box.
Grade 2 surplus cans have cosmetic issues like paint chips, light surface rust, or worn labels, but the gasket and latch still work. Many Grade 2 cans are functionally identical to Grade 1 once you wipe them down.
For most buyers, Grade 2 is the value play. You get the same steel construction and the same seal integrity for less money. Just inspect the gasket before you trust the can with long-term storage. If the gasket is cracked or hardened, replace it with a generic rubber gasket from a hardware store before loading ammo.
Humidity Control and Desiccant Maintenance
Even with a perfect seal, the air trapped inside your ammo can contains moisture. Over time that moisture settles on brass and causes corrosion. The fix is a desiccant pack.
Silica gel desiccant packs absorb moisture from the air inside the can. For a 30 or 50 caliber ammo can, one or two medium silica gel packs are enough. Replace or recharge the packs every 6 to 12 months by baking them in an oven at 250 degrees for 1 to 2 hours.
Indicating silica gel (the kind that changes color when saturated) is worth the small extra cost. You can see at a glance when the desiccant needs recharging. For long-term storage in humid climates, add a humidity indicator card so you have a permanent record of the conditions inside the can.
Concrete Floor Warning and Storage Tips
Never store ammo cans directly on a concrete floor. Concrete wicks moisture from the ground, and that moisture will rust steel cans and corrode brass over time even through a sealed lid. Always store cans on a wooden pallet, a shelf, or a plastic mat at least an inch off the concrete.
Other quick tips: avoid storing cans in direct sunlight, which degrades rubber gaskets over time. Avoid attics, which can reach 130 degrees in summer and damage primers. A climate-controlled closet, gun safe, or basement with a dehumidifier is ideal.
Labeling and Organization Discipline
If you build up a stash of multiple ammo cans, labeling becomes essential. A can full of mixed calibers is useless when you need to grab 5.56 in a hurry. Label each can clearly with caliber, lot, and date. Painter’s tape and a permanent marker work in a pinch, but printed labels are more durable.
Rotate your stock. Ammo you bought first should be used first, especially for self-defense calibers where shelf life matters. A simple “first in, first out” policy prevents old ammo from sitting forgotten at the bottom of the pile.
Frequently Asked Questions About Ammo Cans
Are metal or plastic ammo cans better?
Both work for most storage situations. Steel cans are heavier, more crush-resistant, and have a nostalgic military look. Polymer cans are lighter, often cheaper, and modern O-ring seals keep out humidity just as well as steel for typical indoor storage. Pick steel for long-term basement or garage storage. Pick polymer for range trips and everyday carry.
What is the difference between Grade 1 and Grade 2 ammo cans?
Grade 1 military surplus cans are in excellent condition with intact gaskets, working latches, and minimal cosmetic wear. Grade 2 cans have paint chips, light surface rust, or worn labels but the gasket and latch still function. Most buyers get better value from Grade 2, just inspect the gasket before trusting the can with long-term storage.
What is the best way to store ammunition?
Store ammo in a sealed ammo can or ammo box with a rubber gasket or O-ring seal, kept in a climate-controlled space between 55 and 75 degrees Fahrenheit. Add a silica gel desiccant pack to absorb trapped moisture, and never store cans directly on a concrete floor since concrete wicks moisture and causes rust.
How long should ammo be stored?
Properly stored ammunition can last 20 to 30 years or longer without significant degradation. Modern military and commercial ammo uses non-corrosive primers and sealed cases that hold up well in dry conditions. The main enemy is humidity, which causes brass corrosion and primer degradation, not time itself.
Why do ammo cans need desiccant?
Even a sealed ammo can traps air inside, and that air contains moisture. Over time the moisture settles on brass casings and causes corrosion, pitting, and primer degradation. Desiccant packs absorb that moisture and keep the inside of the can dry. Recharge or replace silica gel packs every 6 to 12 months.
What size ammo can do I need?
A .30 caliber can holds 6 to 8 boxes of handgun ammo or about 1,000 rounds of 5.56, and is the right size for range trips and pistol caliber storage. A 50 caliber can holds 10 to 15 boxes of rifle ammo or about 1,500 to 2,000 rounds of 5.56, and is better for bulk rifle storage. Pick .30 cal for portability and 50 cal for capacity.
Final Verdict on the Best Ammo Cans
After testing, comparing, and reading thousands of buyer reviews, our team is confident in these picks for the best ammo cans available right now. The Sheffield 12626 takes the overall crown for handgun ammo and range trips, while the MTM AC50C-40 is the right call for rifle shooters with bulk stashes. For a true watertight steel option, the Reapr Steel Ammo Can is hard to beat.
If you remember three things from this guide, make them these: pick the right size for your caliber, always add a desiccant pack, and never store cans directly on concrete. With those habits and one of the cans above, your ammunition will stay dry and reliable for decades.