we could always implant an RFID chip into you, so be thankful you just need the bigger wallet.
My ideal would be a single card that acts as a storage device -- dry cleaning receipts, subway, movie tickets, ATM, credit card, etc. etc.
I can't get a bigger wallet, it already looks like I've got three butt cheeks.
in europe - that's your cell phone. you can make purchases with them, they can control vending machines, etc.