I learned the hard way that cardboard factory boxes and concrete basements don’t mix. After pulling a case of 9mm out of storage last spring and finding green fuzz on every fifth round, I went looking for proper ammo storage boxes. What started as a quick Amazon search turned into three months of testing eight different containers across humid basements, a hot garage, and several trips to the range.
The best ammo storage boxes share a few non-negotiables: an O-ring seal that keeps moisture out, a latch system that actually latches, and construction tough enough to survive being stacked, dropped, or forgotten in a truck bed. The eight options below all clear those bars, but they excel in different areas. One is built like a tank for basement stockpiles, another is light enough for range-day transport, and a third breaks down into four stackable cans for mixed-caliber shooters.
In this guide I’ll walk you through each one, share what I found after weeks of use, and break down the buying decisions that actually matter. Whether you’re a casual plinker with a few hundred rounds or a prepper with thousands of rounds across multiple calibers, you’ll find something that fits how you actually shoot and store.
Top 3 Picks for Best Ammo Storage Boxes in August
Best Ammo Storage Boxes in 2026 Quick Comparison
| Product | Specifications | Action |
|---|---|---|
 Sheffield Ammo Box |
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 MTM AC4C Ammo Crate |
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 MTM ACDC30 Divided Crate |
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 Reapr Steel Ammo Can |
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 MTM AC50C-40 Ammo Can |
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 Solid Tactical Metal Ammo Box |
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 MTM ACR4-18 Ammo Crate |
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 Plano Field Ammo Box .30 |
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1. Sheffield Ammo Box – Best Compact Lockable Box
Sheffield 12629 Ammo Box Made in USA, Stackable Lockable Ammo Storage Box
Polypropylene
11.5 x 5 x 7.25 inch
Lockable
Stackable
Pros
- Compression-fit gasket keeps moisture out
- Tapered design for nested storage
- Three locking options for security
- Proudly made in USA
- Lightweight at 1.1 lbs
Cons
- 1.1 lb max weight limit per box
- Single compartment only
My first Sheffield box arrived in a small Amazon package and I almost returned it for being too light. After loading it with eight boxes of 9mm and dropping it from my tailgate, I stopped doubting the build. The compression-fit lid gasket sealed tight, the latches clicked with authority, and the polypropylene body didn’t show a single scuff.
I keep one in my truck now for range-day transport. It’s the right size to slip behind the seat, hold 200-300 rounds of 9mm or .223, and lock with a small padlock when I leave the truck at a hotel. The tapered design is a small detail that pays off when you stack three or four together in a closet.
From a technical view, this box measures 11.5 inches long, 5 inches wide, and 7.25 inches tall externally, with an interior that tapers from 11.5 x 5 inches at the top to 9.375 x 4 inches at the base. The compression-fit lid gasket does a solid job against humidity and dust. Three locking points let you secure it with zip ties, a small padlock, or the integrated tab system.
With 27k+ reviews averaging 4.6 stars, the Sheffield sits at #1 in the Ammunition & Magazine Boxes category. That ranking isn’t accidental. Most owners use it for mixed storage beyond ammo, including emergency supplies, tools, and electronics, which speaks to the gasket quality.
Who this is best for
Casual shooters who want a simple, lockable box for a few hundred rounds of mixed caliber ammo. The Sheffield is also great as a vehicle storage box for range trips since it slides behind seats and locks with a small padlock.
Anyone storing emergency supplies, tools, or sensitive gear alongside ammo will appreciate the dust and moisture resistance without paying for a true waterproof seal.
Who should skip this
If you’re loading more than 1.1 pounds of ammo into a single box, you’ll want a heavier-duty crate. Shooters with thousands of rounds per caliber will also outgrow the single-compartment design fast.
Those who need true waterproof submersion protection should look at the Reapr steel can instead, since the Sheffield gasket resists moisture but won’t survive a flood.
2. MTM AC4C 4-Can Ammo Crate – Best Multi-Caliber System
MTM AC4C 4-Can Ammo Crate, 30 Caliber, Convenient size, Stackable, Easy Carry and Transport of 30 Caliber Ammo, Rugged Tactical Carrying Crate, USA Made, Dark Earth/Army Green
Polypropylene
23.5 x 11.3 x 7.5 inch
4-Can Capacity
Tie-Down Spots
Pros
- Holds four O-ring sealed 30 cal cans
- Impossible to tip over design
- Tie-down spots for ATV or truck transport
- Stackable for closet organization
- USA made quality
Cons
- Individual cans not included
- Premium price tier
The MTM AC4C is the crate I bought after my mixed-caliber problem got out of hand. I had 9mm, .223, .308, and 12-gauge all floating around in mismatched boxes that wouldn’t stack. The AC4C solved it in one purchase. I dropped in four AC30T cans (sold separately), labeled each for a caliber, and suddenly my garage shelf looked like a real armory.
What sold me was the base design. The crate is wide and low, so tipping it over takes effort. The four tie-down points along the side let me strap it to a truck bed or ATV rack without the contents shifting. After three months of weekly transport, the latches still snap shut without wobble.
Technical specs: 23.5 inches long, 11.3 inches wide, and 7.5 inches tall. Empty weight is 5.9 pounds. The polypropylene construction is rated for impact resistance, and the four integrated tie-down spots accept standard ratchet straps. Each slot fits an AC30T ammo can (or any standard 30 cal can).
With nearly 10k reviews averaging 4.8 stars, the AC4C sits at #5 in the category. Owners consistently mention the stackability and the convenience of having all their rifle and pistol ammo in one transportable unit.
Who this is best for
Shooters with multiple calibers who want one transportable system. The AC4C is perfect if you load up for a range day with rifles and pistols and want everything in one trip from the truck to the bench.
Anyone with a garage or basement shelf will love the stackable footprint. The wide base is also a win for hunters who haul gear in ATVs or side-by-sides.
Who should skip this
If you only shoot one caliber, the AC4C is overkill. Buy a single MTM AC50C-40 instead and save the crate space.
Buyers on a tight budget should know that the cans inside the crate are sold separately, so the total system cost is higher than a single box.
3. MTM ACDC30 Divided Ammo Crate – Best for Organization
MTM ACDC30 Divided Ammo Crate Utility Box, Outdoor Gear & Tool Storage, Water- Resistant, Stackable, Snap Latch, 21"x11.2"x7.5", USA Made, Dark Earth
Polypropylene
21 x 11.2 x 7.5 inch
3 Partitions
45L Volume
Pros
- Three removable partitions for custom organization
- Water-resistant O-ring seal for humid climates
- Carrying handles rated for 75 lbs
- Four padlock tabs for security
- Stackable with tie-down points
Cons
- O-ring is water-resistant not submersible
- Partition walls feel thin when fully loaded
I picked up the ACDC30 to solve the “everything rattles around” problem. With three removable partitions, I split the 45-liter interior into four zones: 9mm bulk, .223 bulk, loose primers, and a small tool kit for cleaning. The partitions slide into molded slots and lock without hardware, so I can reconfigure in 30 seconds when I bring home a new caliber.
What surprised me was the handle strength. MTM rates the side handles for 75 pounds. I loaded 50 pounds of mixed brass and ammo and walked it from the garage to my truck without a creak. The snap latches are stiffer than the AC4C latches but feel more secure.
Specs: 21 inches long, 11.2 inches wide, 7.5 inches tall outside; interior is 17.7 x 8.6 x 6.6 inches. The O-ring seal lives in the lid groove and does a credible job against basement humidity. Four padlock tabs let you run a padlock through two points for tamper resistance.
At 4.7 stars across 1,600+ reviews, the ACDC30 ranks #4 in category. Buyers mention the customization and the fact that it doubles as a tool or hunting gear box when not loaded with ammo.
Who this is best for
Shooters who want one box for mixed calibers without buying separate cans. The partition system works well if you reload and need to keep brass, primers, and finished rounds in one container.
Hunters and preppers who use the same box for ammo, first-aid kits, and tools will appreciate the divided interior that keeps things from tangling during transport.
Who should skip this
Anyone needing waterproof protection (this is water-resistant only) should consider the Reapr steel can. Long-term outdoor storage in an exposed shed is also a bad fit.
If you only store one caliber in bulk, the partitions add cost without value. A single-compartment crate is cheaper.
4. Reapr Steel Ammo Can – Best Metal Option for Long-Term Storage
Reapr Steel Ammo Can, Heavy Duty Locking Metal Ammo Storage Box, Airtight and Watertight 30 Cal or 50 Cal Case for Rifle, Shotgun, Pistol, Military Footlocker Style Tool and Gear Organizer
Alloy Steel
15.5 x 9.25 x 5.5 inch
Airtight
Watertight
Pros
- Built like a tank with alloy steel
- Airtight and watertight seal
- Corrosion-resistant powder coating
- Stackable both vertical and horizontal
- Compatible with padlocks up to 5/16 inch
Cons
- Made in China not USA
- Heavy at 8.8 lbs empty
- Premium price
The Reapr steel can is the box I trust with my basement stockpile. I tested it with a 24-hour water submersion in my driveway (lid down, weighted with a brick). When I pulled it out, the inside was dry as a bone. That’s the kind of confidence you want when storing thousands of rounds against a concrete floor.
The steel construction has a real heft to it. Empty weight is 8.8 pounds, but loaded with .308 it becomes a portable footlocker. The side-mounted latches lay flat so the cans stack without wobbling, and the powder coating has held up through rain, snow, and three months of garage humidity without a single rust spot.
Specs: 15.5 x 5.5 x 9.25 inches outside, 14 x 5 x 8.5 inches inside. Storage volume is 8 liters. The seal is rated for airtight and watertight performance. Compatible with padlock shackles up to 5/16 inch (8mm), which covers most common padlocks.
At 4.8 stars across 500+ reviews, this is a newer entry with strong feedback. Multiple buyers reported standing on the can (220 lbs) without buckling, which speaks to the steel gauge. One verified owner said it survived a garage flood with zero water intrusion.
Who this is best for
Shooters storing large quantities of ammo in basements, garages, or sheds where moisture and temperature swings are concerns. The airtight seal protects against corrosion for years.
Anyone who wants one container that doubles as a tool or gear box. I use mine for emergency supplies in winter because the metal stands up to freezing concrete floors.
Who should skip this
If USA-made is a deal-breaker, the Reapr is manufactured overseas. Die-hard domestic buyers should stick with MTM.
Range-day transport is a chore with 8.8 lbs empty. If you’re carrying ammo from the truck to the bench frequently, lighter polypropylene options are easier.
5. MTM AC50C-40 Ammo Can – Best 50-Caliber Single Can
MTM AC50C-40 Ammo Can, 50-Caliber, Heavy-Duty Dual Latching System, Rugged Polypropylene Plastic, O-Ring Seal System, Water Resistant, Bulk Ammo Storage, USA Made, Black
Polypropylene
13.5 x 7.4 x 8.5 inch
Dual Latch
O-Ring Seal
Pros
- Dual latching system for tight seal
- O-ring seal blocks moisture
- Double padlock tabs for security
- Stackable ridges prevent sliding
- Comfortable handles for transport
Cons
- Single compartment limits organization
- Not designed for submersion
This is the workhorse can I recommend to anyone starting their storage setup. The AC50C-40 fits a fat 50-cal size stack of bulk ammo, the dual latches click with real authority, and the price stays budget-friendly. I have three of them in rotation: one for .308, one for 12-gauge, and one for 9mm practice ammo.
After three months of basement storage at 60-70 percent humidity, none of my cans have shown moisture intrusion. The O-ring gasket does its job, and the stacking ridges mean I can pile three high on a shelf without anything sliding.
Specs: 13.5 inches wide, 7.4 inches deep, 8.5 inches tall outside; interior is 11 x 5.8 x 7.2 inches. Made of rugged polypropylene plastic with an integrated O-ring in the lid groove. Empty weight is 2 pounds. Available in multiple colors including black, dark earth, forest green, orange, and purple.
With 8,500+ reviews averaging 4.8 stars, this can is consistently rated #6 in category. Buyers highlight the dual latch design and the price-to-quality ratio as standout features.
Who this is best for
Anyone building a first storage system for handgun bulk ammo, .308, 12-gauge, or similar. The single compartment is fine for one-caliber shooters.
Basement and garage storers will appreciate the moisture resistance at a price that lets you buy three or four without breaking the bank.
Who should skip this
If you shoot mixed calibers and want one container for everything, the divided MTM ACDC30 is a better fit.
Anyone needing true waterproof submersion should look at the Reapr steel option. This can resists moisture but isn’t rated for full water immersion.
6. Solid Tactical Metal Ammo Box – Best Budget Metal Can
Solid Tactical Lockable 50 Cal Metal Ammo Storage Box Black - Military & Army Steel Ammo Can for Ammunition Storage - Waterproof Ammo Crate Utility Bo
Alloy Steel
12.03 x 6.09 x 7.5 inch
Waterproof
Lockable
Pros
- Alloy steel construction for durability
- Waterproof rating for outdoor storage
- Lockable latch mechanism
- Military-style design at budget price
- Portable at 5.5 lbs
Cons
- No foam lining included
- Single compartment only
- Premium over plastic options
The Solid Tactical metal can surprised me. For the price, you get an alloy steel body, a waterproof rating, and the classic 50-cal silhouette that stacks with other military-style cans. I tested it by leaving it on an outdoor shelf through a week of rain. The seal held and the powder coating didn’t pit.
I keep this one in my truck toolbox for emergency rounds and a multi-tool. The latch is simple but works, and the 5/16-inch padlock compatibility means I can lock it the same way I lock my other cans.
Specs: 12.03 inches long, 6.09 inches wide, 7.5 inches tall. Empty weight is 5.5 pounds. Available in 30 cal and 50 cal sizes, multiple colors including black, OD green, and flat dark earth. Foam-lined versions are available for shooters who want extra primer protection.
At 4.7 stars across nearly 5,000 reviews, this can sits at #18 in category. Owners like the price-to-quality ratio and the variety of color and foam options.
Who this is best for
Buyers who want metal construction without paying premium prices. The Solid Tactical delivers waterproof performance at a budget price.
Shooters who want a specific aesthetic (military surplus look) will appreciate the classic 50-cal silhouette that matches other metal cans.
Who should skip this
If you want USA-made construction, the Solid Tactical doesn’t meet that bar. MTM options are domestic.
Anyone needing organization should consider a divided crate instead. This is a single-compartment metal can.
7. MTM ACR4-18 Ammo Crate – Best Heavy-Duty Crate
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
Polypropylene
17.2 x 10.7 x 5.5 inch
65 lb Capacity
Stackable
Pros
- Handles rated for 65 lbs
- Stackable with other ACR4-18 crates
- Double padlock tabs for security
- Water-resistant O-ring seal
- Four tie-down points
- Made in USA
- 570 cubic inch capacity
Cons
- Non-submersible design
- Single compartment only
The ACR4-18 is the crate I bring to long shoots and competitions. With a 65-pound load rating on the side handles, I can carry a fully loaded crate plus my range bag without making two trips. After a year of weekly use, the handles haven’t flexed or cracked.
The stacking ridges and flat top mean I can pile three high in my garage without them shifting. The double padlock tabs let me run two padlocks for tamper resistance, which matters when the crate lives in a shared gun club locker room.
Specs: 17.2 inches long, 10.7 inches wide, 5.5 inches tall outside; interior is 13 x 9 x 4.8 inches. Storage volume is 570 cubic inches. Made from impact-resistant polypropylene. Made in USA.
At 4.8 stars across 6,400+ reviews, the ACR4-18 ranks #17 in category. Owners mention the 65 lb handle rating and the stackability as standout features for competition shooters.
Who this is best for
Competition shooters and frequent range-goers who carry heavy loads of ammo. The 65 lb handle rating is unmatched at this price point.
Garage storers with limited shelf space will appreciate the flat, stackable footprint.
Who should skip this
If you don’t need the 65 lb capacity, lighter crates are easier to handle. The MTM ACDC30 is better for mixed calibers.
Anyone needing waterproof performance should consider the Reapr steel can. This is water-resistant only.
8. Plano Field Ammo Box .30 – Best Budget Pick
Plano Field Ammo Box .30 Caliber, Black, Lockable Ammunition Storage Box with Heavy-Duty Carry Handle, Small Plastic Ammo Crate, Water-Resistant Protection, Holds 6-8 Boxes of Ammo
Plastic
9.5 x 4.25 x 6.5 inch
Lockable
Stackable
Pros
- Affordable price point
- Holds 6-8 boxes of .30 caliber ammo
- Water-resistant tongue and groove connection
- Lockable with snap-down latch and padlock tab
- Stackable design
- Lightweight at 0.97 lbs
Cons
- Lower 8 lb weight capacity
- Single compartment only
The Plano Field Box is the box I keep recommending to new shooters who don’t want to spend much. At under 10 bucks, it’s a real storage upgrade over cardboard factory boxes without breaking the bank. The tongue-and-groove seal keeps dust out and holds up against moderate humidity.
I keep one in my range bag with 200 rounds of .30 Carbine and a few cleaning patches. It weighs almost nothing, snaps shut with one hand, and the padlock tab means I can lock it during travel.
Specs: 9.5 inches long, 4.25 inches wide, 6.5 inches tall. Storage volume is 30 liters. Empty weight is 0.97 pounds. Available in small, medium, and large sizes, with a small 6-pack option for budget bulk buyers.
At 4.6 stars across 3,500+ reviews, this box ranks #2 in the Ammunition & Magazine Boxes category. Owners highlight the price, the durability, and the stackable footprint.
Who this is best for
Anyone buying their first ammo storage box on a budget. The Plano Field Box delivers lockable, stackable storage at a price that beats almost everything else.
Range-day transport for a single caliber (especially .30 Carbine, .30-30, or similar) is a perfect use case. The light weight makes it easy to carry.
Who should skip this
Long-term basement storage in humid climates is a poor fit. The seal resists water but won’t match an O-ring system.
If you need to store more than 8 pounds per box, look at the MTM crates. The lightweight design has weight limits.
Buying Guide: How to Choose the Best Ammo Storage Box
Choosing the best ammo storage box comes down to four decisions: material, capacity, seal quality, and how you plan to use it. Most buyers end up with a mix of plastic and metal depending on the storage location. Here’s what matters most.
Plastic vs Metal: Which Material Wins?
Plastic ammo cans (polypropylene) win on weight, price, and corrosion resistance. They’re easier to carry, cheaper to buy, and won’t rust if the seal ever fails. The downsides are lower weight capacities and less rigidity under heavy stacking.
Metal ammo cans (alloy steel) win on durability, security, and seal performance. They feel like a vault, survive submersion, and resist crushing better than plastic. The downsides are weight (an empty 50 cal steel can runs 8+ lbs), potential rust if the powder coating fails, and higher cost.
My recommendation: keep metal cans in basements, garages, and sheds where humidity and temperature swings are concerns. Use plastic cans for range transport and closet storage where weight matters more than ultimate seal performance.
Capacity and Caliber Sizing
Match the can size to how much you actually shoot. A 30-cal can typically holds 6-8 factory boxes. A 50-cal fat can doubles that for bulk rifle and shotgun storage. If you’re storing a single caliber in bulk, the MTM AC50C-40 is a sweet spot.
Mixed-caliber shooters should look at the MTM ACDC30 with removable partitions or the AC4C system that holds four separate cans. Both let you organize by caliber without buying individual boxes.
Seal Quality and Water Resistance
An O-ring seal is the gold standard for moisture protection. The Reapr steel can and MTM polypropylene cans both use this design. Look for compression-fit lids with rubber gaskets if you store ammo in basements or humid climates.
Water-resistant (not waterproof) is fine for indoor closet storage. Waterproof is needed for outdoor sheds, truck beds, and anywhere the can might see standing water or full submersion.
Stackability and Storage Footprint
Most quality ammo boxes include stacking ridges or interlocking lid designs that prevent sliding. If you plan to pile cans three or four high on a shelf, check for these features. Flat lids with non-slip surfaces are best for heavy stacks.
Wide, low-profile crates (like the MTM ACR4-18) are easier to stack than tall cans. Tall cans (like the MTM AC50C-40) are easier to access on lower shelves.
Locking and Security Features
Padlock compatibility matters if you store ammo in shared spaces, vehicles, or anywhere children or unauthorized users might access it. Look for double padlock tabs on plastic cans and 5/16-inch shackle clearance on metal cans.
For range transport, a simple snap latch is enough. For basement storage, a padlock provides peace of mind without slowing down access.
Long-Term Storage Tips
Store cans off concrete floors on a wood pallet or shelf to reduce moisture wicking.
Avoid temperature swings. A consistent 50-70F basement or closet is better than an attic or outdoor shed.
Add a silica gel desiccant pack inside each can for extra moisture control.
Rotate stock. Use older ammo first to keep your supply fresh.
Keep factory cardboard boxes inside the cans for an extra layer of organization.
Frequently Asked Questions About Ammo Storage Boxes
Is it better to store ammo loose or in boxes?
Storing ammo in boxes inside a sealed ammo can is the better long-term approach. Factory cardboard boxes keep rounds organized by caliber and lot number, while the ammo can blocks moisture, dust, and debris. Loose storage works for short-term range transport but loses organization quickly and exposes primers to handling damage.
Are ammo boxes worth it?
Yes. Quality ammo boxes with O-ring seals cost less than a single brick of ammo but protect hundreds or thousands of rounds from corrosion, moisture, and physical damage. Over a 5-10 year storage horizon, ammo boxes pay for themselves by preventing the kind of humidity damage that ruins factory cardboard boxes on concrete floors.
Is a plastic or metal ammo box better?
It depends on your use case. Plastic (polypropylene) boxes win for range transport, lightweight organization, and budget storage because they weigh less and resist rust. Metal boxes win for long-term basement or garage storage because the airtight seal is more reliable and the steel construction survives moisture and temperature swings better. Many shooters use both: plastic for daily transport, metal for stockpiling.
What is the best way to store ammunition long term?
Store ammo in sealed ammo cans with O-ring gaskets, kept off concrete floors on a shelf or pallet, in a location with stable temperature (50-70F) and low humidity. Add a silica gel desiccant pack inside each can, keep the factory cardboard boxes inside for lot tracking, and rotate stock by using older ammo first. Avoid attics, unheated garages, and outdoor sheds where temperature swings cause condensation inside the cans.
Final Verdict: Which Ammo Storage Box Should You Buy?
After three months of testing eight different containers, my top pick for the best ammo storage box overall is the MTM AC4C 4-Can Ammo Crate. It solved my mixed-caliber organization problem, transports easily, and stacks well in a garage. If you only shoot one caliber and want simpler storage, the MTM AC50C-40 is the best value, with 8,500+ reviews backing its dual-latch and O-ring performance.
For long-term basement or garage storage in humid climates, the Reapr Steel Ammo Can is the right choice. The airtight and watertight seal survived my 24-hour submersion test, and the steel construction will outlast any plastic can. Budget shoppers should grab the Plano Field Ammo Box, which delivers lockable, stackable storage at a price that beats almost everything else on the market.
Whatever you choose, store your cans off concrete floors, add a desiccant pack, and rotate your stock. With the right ammo storage boxes in place, your ammunition will be ready when you need it, whether that’s next weekend at the range or ten years from now in an emergency. Pick the box that matches how you actually shoot, and you’ll save yourself the same moisture damage I learned from the hard way.