The curiously effective video game carrying case

When I carry around my PSP or my DS I like to lug around a few extra games too. However, it's easy to drop and lose a DS cart and UMD discs can get scratched. My soultion? Altoids tin cases. The circular mint case perfectly holds three UMDs and the tiny gum case can hold up to eight DS games. Sure, the solution isn't as effective as a carry all case. But when I'm roaming around the city the altoids case and a single console fit snugly in my pocket.

Anyone else have creative ideas on how they hold their PSP/DS games?