We’re always looking for thinner wallets to avoid sporting a Costanza. Unfortunately a paper thin wallet usually only accommodates a few essentials.. That means that gift card you’ve been hanging on to since your birthday gets left in a drawer to be forgotten. But thanks to Coin, you can bring just one card and still have access to all of your credit cards, debit cards, gift cards, and membership cards. You just load new cards with a credit card reader that connects to your smartphone and manage them with the Coin app. There’s a button on the card itself that lets you toggle between cards. For security purposes Coin also connects to your phone via Bluetooth to let you know if it’s no longer near you. Normally Coin will cost $100, but for early adopters it’s only $50.