The 'L' Mighty Wallet features the licensed imagery of Chicago's famous elevated train. The Mighty Wallet™ is tear-resistant, water-resistant, expandable and recyclable. Made from Tyvek® (think express mail envelopes), the Mighty Wallet™ resists tearing because of thousands of interlocking plastic fibers spun in random patterns giving the wallet incredible strength. The ingenious origami design reinforces that strength by using a single folded stitch less construction allowing the wallet to gradually expand and adapt to meet your own personal storage needs. The Mighty Wallet™ will expand right before your eyes. Because of the slim, lightweight and water resistant features, you can take your Mighty Wallet™ anywhere. It makes a great "night out" wallet for a slender silhouette and the writable surface conveniently acts as a quick note pad on the go. In time, the Mighty Wallet™ will gradually soften and patina but, even after years of wear, it will still offer surprise and solicit intrigue.