Men's Bifold Envelope System Wallet For Cash Budgeting and Couponing (Black) ripstop nylon may feel "papery" or sound "crinkly" at first, it is amazing because allows this wallet to have 5 separate cash category slots and remain thinner than a traditional wallet! We love Ripstop Nylon because it is paper thin and extremely long lasting! This wallet is less than 1/3 of an inch thick when it is empty and the rip stop nylon makes it very durable. This wallet is a unique solution to keep your cash organized because it has 5 separate cash sections.