Can Safe

Can safe. The internal dimensions are roughly 2.25 inches diameter and maybe 7 inches deep (60 D x 180 mm)... wide enough to fit credit cards.

I used a "safety" can-opener to remove the bottom of this can. They allow you to replace the top (or bottom) of a can, and use it as a lid, and there's no sharp edges.
My can opener is described in this other project. $6. https://www.thingiverse.com/thing:3056479

Both the end-cap ring, and the internal ring, were attached with hot melt glue.

Fo