Great idea! Next time I need to toss something on the counter to ring up with a GC I may go for that. I wonder if they also prevent the bad guys from getting your card numbers from cards in your wallet? I forget the way they do it but it's the process some safety wallets try to prevent....
Altoids has a $1 off coupon every 4-6 weeks or so in the Sunday paper. I alternate Wash Post & Baltimore Sun on the yearly Groupons that can be had for $8 for a subscription.
I really love the Altoids tin. My wallet only holds 4 cards comfortably, now I don't have to consider which cards I need for the day anymore. I just take them all in one of those.