Ammo Boxes as Bit Holders: MTM Case Guard 100 and MTM Case Guard 30 Tested

Introduction

There is a small trend worth talking about: people repurposing ammunition storage boxes as workshop bit holders. It sounds odd until you look at the actual products, which are molded plastic cases with rows of snug interior slots. Two cases from the same maker, MTM Case Guard, turn out to handle driver bits surprisingly well, and they cost far less than dedicated bit organizers.

Both boxes are made in the USA out of Dayton, Ohio, and MTM backs them with a ten-year guarantee for their intended use. Whether storing bits technically qualifies is a fair question, but in practice the slots grip them firmly and release them easily. Here is how the two sizes compare.

Why Ammo Boxes Work So Well for Bits

The appeal is simple: these cases already solve the exact problem a bit holder solves, which is holding many small cylindrical items in fixed rows without letting them touch or rattle. Slot spacing matters, though. Pushing bits directly next to each other takes real force, almost to the point of damaging the case. Leave a slot of space between each bit and they drop in with only slight resistance, then pop out nicely and easily when you need them.

You also get genuine organization potential. The row-and-column layout means each bit has an address, so you can label positions or simply remember where each size lives. For the money, it is hard to argue with the system.

MTM Case Guard 100 (P-122)

This is the clear winner. The MTM Case Guard 100, model P-122, is designed to hold cartridges from 22 caliber up to 25 caliber, and that slot range happens to fit driver bits nearly perfectly. A bit measuring roughly a 24 to nearly 25 caliber slides in with just a hint of stickiness and stays put.

Unlike many budget molded cases, this one uses an actual hinge, which makes it feel like a solid toolbox rather than a throwaway container. The lid snaps shut tight, an area where cheaper cases often fail, and the lid does appear to separate from the body if you deliberately pull it off, but in normal use it holds on snugly. It holds roughly 100 bits, all sitting solidly in their slots.

At a little over three dollars on Amazon, the value is remarkable. Cases costing four to five times as much do not hold this many bits this securely. It is easy to see buying several and building out a full organization system.

MTM Case Guard 30

The smaller sibling is the MTM Case Guard 30, which is sized and shaped like a man’s wallet and is sold to hold both 17 caliber and magnum cartridges. As a bit holder, it works: bits stay in solidly, though you do have to pop them in with a bit of force, and it is an open question how well that grip holds up over time or in cold weather.

It holds 30 bits, less than a third of what the larger case manages, and it skips the real hinge mechanism; the lid simply pops off if you pull on it, though otherwise it stays on nicely and snugly. The plastic feels heavier and sturdier than you might expect at this size.

Where it makes sense is for specialty bits or keeping a small selection separate, the way fly anglers use cases this size to organize flies. At seven dollars and change on Amazon, it is a fair buy for that specific purpose rather than a general bit holder.

The Full Price Picture

There is also a third option out there for anyone who values humor as much as utility: a flexible, rubbery double-sided bit holder that bends like a paddle and holds 14 bits per side for 28 total. It is genuinely ridiculous to look at, which is partly the point, and it arrived with a small rubbery bit set of 32 bits, 16 per side, plus a magnetic bit holder. The whole package ran a little over 20 dollars. It is more of a gag gift for the person who has everything than a serious organizational upgrade, but it does the job.

Put the three side by side and the math is simple: 100 bits for about three dollars, 30 bits for about seven dollars, or 28 bits for over 20 dollars. The large MTM Case Guard 100 wins on every practical measure.

Conclusion

Repurposing ammo boxes as bit holders is one of those ideas that works better in practice than it sounds. The MTM Case Guard 100 (P-122) is an outright steal with its real hinge, tight snap closure, and 100-bit capacity for a few dollars. The MTM Case Guard 30 is a reasonable niche pick for carrying a small set of specialty bits. Both are made in the USA and backed by a ten-year guarantee for their intended purposes, and either way, your bits end up organized, solid, and easy to pop out when you need them.