George Costanza would love the Loop: it's a tiny device that stores all of your credit card information, lets you pay at any terminal, and guarantees you'll never live with the threat of your wallet exploding again. And you can buy it right now.
If Loop sounds familiar, you might be thinking of Coin, the slim programmable card that made a splash late last year. There are a couple of key differences, though. Whereas Coin requires swiping, Loop works by generating a magnetic field that registers as a swipe at credit card terminals.