Review on Minimalist Aluminum Organizers for Men's Accessories: Automatic Wallets, Card Cases & Money Organizers by Lungogo by Chris Pettway

That is so cool! When I first got it in the mail I didn't know what to think of it - or how to use it because it didn't come with any pictures or instructions. But you don't actually need anything, you simply insert the cards until they are full. When you need a card, flip the little lever at the bottom back and forth and all your cards come out in a checkerboard pattern so you can just grab the one you need. Plus it's SOOOOO compact - I'm really impressed with how cool it is.