So, for some extra flash drive security at my school, I made myself an Altoids flash drive safety case.
Step 1: Supplies and proceedure.
1. One altoids can
2. Some sort of padding to go in altoids can
3. Exacto knife or something of the likes...
Cut your padding to fit snug into the altoids can. I used 1/2 inch thick closed cell foam padding. Don't know where I got the stuff, but I got it. It's really resiliant, and pretty tuff.
After you've got the padding fitting right in the can, use your exacto knife to cut a hollowish spot for your flash drive. This will keep it dancing around in the altoids can. It should fit snugly into the space that you make.