It's a simple, durable match case that's long enough to hold strike anywhere matches. Plus a little extra room to store a little tinder like a cotton ball or two.
The top is threaded to fit standard soda bottle tops which give a good waterproof seal on the bottle. 3D printed caps don't seal as well. Strike-anywhere matches WILL strike on the side of the bottle! Although this leaves little marks on it. This would be a good useful first 3D printing project for Boy Scouts I think. If you make one, be sure to upload pics.
The threads will print well at 0.2mm layer thickness. No need to go thinner unless you want to. I suggest printing it using PET, which doesn't warp, and is VERY strong.