I don't normally carry cash. I use my debit card for almost everything. Unfortunately their are times when cash is nessesary. Whether it's tipping the pizza guy, making change for poker night, or wheelin-and-dealing at a neighbors garage sale, it is always good to have at least some cash at home. There is no need to stuff your life savings in a matteress, but having access to $100 in small bills comes in handy.