A good ammo box should make your supplies easier to organize, carry, and store—not just give you another container to stack. The right choice depends on how much you need to hold, whether you want separate compartments, and where the box will live.
These 10 MTM and Sheffield options cover single boxes, divided crates, and multi-can setups. Use the buying guide below to narrow down the format that fits your space and routine.
Best 10 Lockable Ammo Storage Boxes Picks for 2026
Best Large Utility Crate
- 570-cubic-inch single compartment
- 65-pound stated carrying capacity
- Double padlock tabs and O-ring seal
Best For: Larger loads in one stackable box
Best Compact OD Green Box
- 216-cubic-inch capacity
- Lockable and stackable
- Water- and dust-resistant
Best For: Compact ammunition and supply storage
Best Four-Can Organizer
- Four included .30-caliber cans
- Stackable polymer crate
- Four transport tie-down spots
Best For: Separating multiple ammunition loads
Best Compact Gray Box
- 216-cubic-inch capacity
- Lockable and stackable
- Water- and dust-resistant
Best For: Compact storage in a gray box
Best for Mixed Gear
- Three removable partitions
- Water-resistant O-ring seal
- Handles rated to 75 lb
Best For: Portable storage for mixed ammo and range gear
Best Compact Pick
- 11.5-inch outside length
- Lockable and stackable
- 30 lb weight recommendation
Best For: Compact storage for ammo or small supplies
Best High-Capacity Crate
- Three adjustable dividers
- Water-resistant O-ring seal
- 85 lb carrying capacity
Best For: Large-volume ammo or hunting-gear storage
Purple Pick
Sheffield 12632 Stackable Ammo Box
- Purple polypropylene box
- Lockable, stackable compression lid
- Water- and dust-resistant
Best For: Color-coded ammunition or supply storage
Teal Pick
Sheffield 12633 Stackable Ammo Box
- Teal, single-compartment box
- Listed 273-cubic-inch capacity
- Lockable and stackable
Best For: Color-coded ammo or household supply storage
Red Pick
Sheffield 12636 Stackable Ammo Box
- Red, 216-cubic-inch box
- Lockable and stackable
- Limited lifetime warranty listed
Best For: Red-coded storage with a stated warranty
Best Large Utility Crate – MTM ACR4-18 Ammo Crate
Among lockable ammo storage boxes, the MTM ACR4-18 offers room for bulkier loads: its single compartment holds 570 cubic inches, with a stated 65-pound carrying capacity. Two side handles make it practical to move when loaded.
Best For: Storing and carrying a larger load in one stackable box.
Pros:
- Double padlock tabs and a stackable design.
- Water-resistant O-ring seal and four side tie-down points.
- Impact-resistant polypropylene construction; made in the USA.
Cons:
- Water-resistant but not submersible.
- One compartment offers no built-in sorting.
Choose this crate when capacity and easy carrying matter more than separating ammunition by type. Its padlock tabs provide a way to secure the lid; padlocks are not listed among the included components.
Best Compact OD Green Box – Sheffield 12626 Ammo Box
If you want compact lockable ammo storage boxes, the Sheffield 12626 is a standard-size, single-compartment option in OD green. Its 216-cubic-inch capacity suits smaller storage loads, including the ammunition types named in its product notes.
Best For: Compact storage of .30 caliber, 9mm, or 5.56 ammunition and other small supplies.
Pros:
- Lockable, stackable polypropylene design.
- Water- and dust-resistant construction.
- Weighs 1.1 pounds empty and requires no assembly.
Cons:
- 216-cubic-inch capacity is smaller than the larger crates in this roundup.
- One compartment does not separate contents.
This is a straightforward choice when shelf space and portability matter. Its stated maximum weight recommendation is 30 pounds, so check your intended load before filling it.
Best Four-Can Organizer – MTM AC4C 4-Can Ammo Crate
For buyers comparing lockable ammo storage boxes, the MTM AC4C takes a different approach: it groups four included .30-caliber ammo cans in one stackable crate. That layout is useful when you want separate containers for different loads rather than one open compartment.
Best For: Organizing multiple ammunition loads in four portable cans.
Pros:
- Includes four .30-caliber ammo cans for separated storage.
- Lightweight, impact-resistant polymer crate is stackable.
- Four tie-down spots support securing the crate for ATV transport.
Cons:
- At approximately 23.6 by 11.25 by 7.5 inches, it needs more storage space than a single compact box.
- The supplied notes do not specify a padlock feature for this model.
Choose the AC4C for its four-can organization and transport-friendly crate, not on an assumption that it locks: confirm the closure arrangement if padlock compatibility is essential. The product notes describe water-resistant sealing, but not submersion protection.
Best Compact Gray Box – Sheffield 12628 Ammo Box
The gray Sheffield 12628 is a compact pick among lockable ammo storage boxes. This standard-size polypropylene field box provides 216 cubic inches of single-compartment storage and a compression lid for ammunition or other small gear.
Best For: Compact, stackable storage when you prefer a gray box.
Pros:
- Lockable and stackable design.
- Water- and dust-resistant material features.
- Weighs 1.1 pounds empty and arrives assembled.
Cons:
- Single compartment does not provide internal organization.
- 30-pound maximum weight recommendation limits heavier loads.
This model makes sense if you want a small, easy-to-place box rather than a larger crate. Its listed resistance is to water and dust; the supplied notes do not describe it as waterproof.
Best for Mixed Gear – MTM ACDC30 Divided Ammo Crate
For buyers comparing lockable ammo storage boxes, the MTM ACDC30 offers room for multiple calibers and range accessories without forcing everything into one compartment. Three removable partitions let you adjust the layout as your gear changes.
Best For: Organizing mixed ammunition and range gear in a portable, stackable crate.
Pros:
- Three removable partitions create up to four compartments.
- Water-resistant O-ring seal helps keep out moisture and dust.
- Four padlock tabs, tie-down points, and handles rated for up to 75 pounds.
Cons:
- Water-resistant, but not submersible.
- Its 21-inch outside length may take more storage space than a compact ammo box.
Choose this made-in-USA crate when adjustable organization and carrying capacity matter more than a small footprint. Add your own padlock if you plan to use the lock tabs.
Best Compact Pick – Sheffield 12627 Ammo Box
The Sheffield 12627 is a smaller option among lockable ammo storage boxes, measuring 11.5 by 5 by 7.25 inches outside. Its single compartment suits ammunition or small supplies when you do not need a divided crate.
Best For: Compact, stackable storage for ammo or other small gear.
Pros:
- Lockable, stackable polypropylene design.
- Water- and dust-resistant construction.
- Lightweight at 1.1 pounds, with a 30-pound maximum weight recommendation.
Cons:
- One compartment offers no built-in separation.
- Smaller capacity than the divided crates in this roundup.
This made-in-USA box is the practical choice if you want a straightforward container rather than a configurable organizer. Check your intended contents against its dimensions and 30-pound weight recommendation.
Best High-Capacity Crate – MTM ACDC50 Divided Ammo Crate
If capacity is your priority in lockable ammo storage boxes, the MTM ACDC50 provides a large divided space for ammunition or hunting gear. Its three dividers can be placed in seven locations, making the interior more adaptable than a fixed-compartment box.
Best For: Storing a large ammunition collection or bulky gear where the crate will not need frequent moving.
Pros:
- Three dividers and seven placement locations offer flexible organization.
- Water-resistant O-ring seal helps keep out water and dust.
- Two lock tabs, four tie-down spots, and an 85-pound carrying capacity.
Cons:
- At 28.2 by 16.9 inches outside, it needs substantial storage space.
- A crate filled with ammo may be cumbersome to move.
This made-in-USA crate makes the most sense as a roomy, stackable storage solution. Its lock tabs add an option for securing the lid, while the size is worth planning for before you buy.
Purple Pick – Sheffield 12632 Stackable Ammo Box
If you want lockable ammo storage boxes in an easy-to-spot color, the purple Sheffield 12632 is a practical choice. This single polypropylene box measures 11.5 x 5 x 7.25 inches and is suited to .30 caliber, 9mm, and 5.56 ammunition, as well as small supplies.
Best For: Buyers who want a purple, stackable box for ammunition or general-purpose storage.
Pros:
- Lockable, stackable design with a hinged compression lid.
- Water- and dust-resistant construction.
- Made in the USA and ready to use without assembly.
Cons:
- One compartment offers no built-in organization.
- Water-resistant, not specified as waterproof.
At 1.1 pounds empty with a stated 30-pound maximum weight recommendation, it is a lightweight option for sorting gear. Choose it for the color and straightforward storage features, rather than for internal dividers.
Teal Pick – Sheffield 12633 Stackable Ammo Box
The teal Sheffield 12633 gives shoppers comparing lockable ammo storage boxes a color-coded option for ammunition, tools, electronics, or emergency supplies. Its standard-size polypropylene body measures 11.5 x 5 x 7.25 inches, with a listed capacity of 273 cubic inches.
Best For: Buyers who want a teal box for distinguishing stored ammunition or household supplies.
Pros:
- Lockable and stackable for organized storage.
- Hinged compression lid and water- and dust-resistant material features.
- Made in the USA; no assembly required.
Cons:
- Single compartment has no built-in sections.
- Only one box is included.
The 30-pound maximum weight recommendation is useful when planning what to pack. Note that this model’s listed 273-cubic-inch capacity differs from the 216-cubic-inch figures supplied for the purple and red models, despite their identical stated exterior dimensions.
Red Pick – Sheffield 12636 Stackable Ammo Box
For shoppers seeking red lockable ammo storage boxes, the Sheffield 12636 is a standard-size option that can also hold tools or emergency supplies. This single polypropylene box measures 11.5 x 5 x 7.25 inches and lists a 216-cubic-inch capacity.
Best For: Buyers who want a red, stackable storage box with a stated limited lifetime warranty.
Pros:
- Lockable, stackable design with a hinged compression lid.
- Water- and dust-resistant material features.
- Made in the USA and covered by a Sheffield limited lifetime warranty.
Cons:
- One compartment provides no built-in dividers.
- Water-resistant rather than specified as waterproof.
It weighs 1.1 pounds empty and has a stated 30-pound maximum weight recommendation. The red finish makes it useful for visual sorting, while the included warranty distinguishes it from the other supplied listings.
How We Picked These Lockable Ammo Storage Boxes
We focused on practical differences within the selected MTM and Sheffield lineup: single-box versus crate-style storage, divided interiors, stackability, carrying arrangements, and provisions for a padlock. A lockable lid can help prevent casual access, but the level of protection depends on the box, the lock you add, and how the box is stored. We did not treat a padlock-compatible box as a substitute for a dedicated security cabinet or safe.
Quick Comparison: Which Format Fits?
Single boxes, including the Sheffield models, are a straightforward choice when you want to sort supplies into separate, movable containers. Divided crates, such as the MTM ACDC30 and ACDC50, suit buyers who want sections within one larger box. Multi-can storage, represented by the MTM AC4C, lets you organize supplies across four removable cans in a shared crate. The MTM ACR4-18 utility crate is worth considering when you prefer one larger carry box; its listed features include a stackable design, double-padlock provision, and a water-resistant O-ring seal.
Key Buying Factors for Lockable Ammo Storage Boxes
Capacity and Loaded Weight
Check usable interior dimensions, not just an exterior size or caliber label. Allow room for the packaging you actually use, then consider whether you can comfortably lift the box when full. The ACR4-18 is advertised for carrying up to 65 pounds of gear; that is a limit to check against your intended load, not a target to fill.
Organization and Access
Choose separate cans or multiple single boxes if you often retrieve one category without moving everything else. A divided crate can reduce loose mixing, while a large open box offers more flexibility for irregularly sized items. Label containers so you can identify contents without opening each lid.
Locking and Placement
Verify the number and fit of padlock points before buying locks; padlocks may not be included. Also consider the container’s portability: a box that can be carried away provides limited theft resistance even when locked. Follow applicable laws and household safety practices, particularly where children or unauthorized users could gain access.
Moisture and Stacking
A water-resistant seal is useful against incidental moisture, but it does not make a box waterproof or eliminate condensation. Store contents in a suitable dry location and inspect them regularly. For stacked boxes, confirm that the lids and bases nest securely, and keep heavier loads low.
Who Should Buy Which Lockable Ammo Storage Boxes?
Pick a Sheffield single box if you want modular storage you can add to over time. Choose an MTM divided crate if internal separation matters more than removable containers. Consider the MTM AC4C if you want four cans that travel together but can be accessed individually. If your priority is one larger stackable utility box, compare the MTM ACR4-18 against your space, lifting needs, and moisture exposure. In every case, match the box to your contents first, then choose a suitable lock and storage location.