Ideal for world travelers who like to travel light, the ultra-thin Big Skinny Passport Holder features two passport pockets plus three pockets that can hold up to four cards apiece. It also features an ID pocket with a clear plastic window for easy access to your driver's license or work badge that can accommodate four cards as well. This version of the Passport Holder features an exterior constructed of top grain cowhide leather and an interior made of Big Skinny's ultra-thin nylon microfiber material to help keep it thinner than a typical wallet. The extra-wide pockets are lined with a rubbery coating to prevent cards from slipping out. The Passport Holder wallet measures 4-1/4 x 5-1/2 Inch (and 4 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.