Inspired by Prusa Live podcast's story of nearly burning down the building, because a seemingly harmless 9-volt battery was loose in a drawer. 

I added a new version with hexagonal holes. The cap doesn't have holes, so it can't short on a loose staple or something.

Also works as a pill bottle or other small things. Stays shut, by the layer lines interlocking. 

I'd recommend draft quality. 

If you want the lid to come off easier. Print two at slightly different layer heights.