The ultra-minimalist Mini Stretch card wallet from Big Skinny holds just the essentials -- only the cards you need and maybe a folded 20 bill for emergencies. The flexible Mini Stretch is made of a thin elastic that wraps your cards tightly and securely and it holds up to 10 plastic cards (not recommended for paper cards). Machine washable. The Mini Stretch wallet measures 3-1/2 x 2-3/16 Inch. 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.