Magnetic container geocaching. Matchbox size.

thingiverse

I designed this container for a U-shaped sign holder with a width of 40mm, but it's also perfect for all magnetic surfaces. The case is extremely stable, measuring 15mm flat, and the lid cannot be misplaced. The rubber-like lid is waterproof, as another case has proven in multiple locations over nearly a year now. The magnet size is precisely 19.7 x 9.5 x 2.8mm cubic. Have fun with it!