I usually carry a big purse around (you never know what you're gonna need and when), but sometimes big purses are a big pain in the ass. Concerts, bike rides, etc. When I don't want to take my purse, I put my ID and debit card in the Zoe. It's super rad; the size and weight of small wallet, the security of a zipper, and the convenience of a shoulder bag. I can also fit car keys and some lip stuff in it, and it fits easily into my coat pocket if I don't want to carry it.