Just recently I purchased a mighty wallet from www.dynomighty.com. This one in particular is known as the "Color Bar Mighty Wallet." They are made of Tyvek® and was designed by Terrence Kelleman. They are a single piece of origami that was incredibly folded into this form. It is tear resistant, water resistant and also made from 25% recycled H.D.P.E which in return makes the whole wallet is completely recyclable. They have many MANY more designs to check out on their website, especially if your looking for an ultra-thin wallet.
Day 195 - The Mighty Wallet, originally uploaded by griffithgreg.