Waterproof for protecting your tiny goods. We are not quite sure what Uncle Sam is putting in his lightweight capsules, but we are using ours to keep small important items close and secure. Will hold a $20.
It's small. It's brass, it has the capability of holding things within itself. It's durable AF, and looks cool. I once used it to hold my hopes and dreams. I've lost them all, but I don't blame the capsule.