I have one in a backpack style. The credit card holder department in zippered and it makes it wonderful for accessing everything from my id to insurance cards. I love it. I'll never go back to a wallet again.
BTW I also like the fact of the backpack style so I can hold at least two kids' hands when taking them to places. The regular purse used to just hit them in the head as it slid off my shoulder. They seem happier with the backpack one. :P