Designed to accommodate 35 to 40 plastic cards, The Big Skinny hipster bi-fold wallet also works in conjunction with Big Skinny hipster insert (which can accommodate another dozen cards; sold separately). the wallet is divided into two stacks, which provides a neat flat surface instead of one big lump. It features three deep pockets that can hold more than eight cards apiece, an id pocket with a clear plastic window that can also hold more than eight cards, a large hidden pocket that holds more than eight cards, and a deep billfold area. The extra-wide pockets are lined with a rubbery coating to prevent cards from slipping out. Designed with rounded corners for comfort, It's constructed of a lightweight, water resistant nylon microfiber material that is 5 to 7 times thinner and lighter than leather. It's machine washable for easy care, and it dries out in about 20 minutes. The hipster bi-fold wallet measures 4-3/8 x 5-3/8 inches (and 3 mm thin when empty). the first Big Skinny wallet was designed by kiril stefan alexandrov (the company's founder) because he loathed sitting on a thick, heavy leather Wallet. Since creating the original sport wallet in 2005 using an advanced nylon micro-fiber material (5 to 7 times thinner than leather), Big Skinny has added dozens of slim wallet styles for men and women with more on the way.