I got my snap press out with the hole punch dies and got to work. And, a regular hole punch will work just as well (I tested it out on a card that was expired), but the snap press was the ticket for a very accurate, smaller hole. I punched all the store cards, taking care not to punch through any bar codes or magnetic strips. I even punched my insurance cards, because I really don't need to have them in my wallet on a daily basis. Then, I strung the cards on a small piece of ribbon, because that's what I had on hand. I think it would work out really well to use a metal ring with a hinge, so you can quickly take one card off, if needed. I plan on leaving the whole pack of cards in my vehicle (yeah, its a swagger wagon, whaaaat), and if I go into, say Panera, I can grab the pack and toss it in my bag.
Do you like how I tried to make you think I was really cool by putting the Anthropologie store card on top? Yeah, well, when it comes to cool cards, that's as far as it goes. I have all my regulars too, like Panera, Costco, Library, CVS, Chiropractor, and of course the Lego Store.