we bought a killer fanny pack at a local sproting good store - its made by mountainsmith - it wears in front, back or on the side, it has compression straps - it can be worn as a fanny pack, back pack, by soft handles like a briefcase, or over the shoulder with a cushioned shoulder strap like a purse - very versatile. And it has good suports for the back should you wear it as a fanny pack. Has several pockets, a main pouch, holds two water bottles and is cushioned. It can hold (I know because this is what I carried) two brita water bottles, a Misty Mate, a Sony TRV miniDV, a kodak Preview APS, wallets, maps, ponchos, fast passes, room keys, safe key, itinerary from CR, and descriptions and pictures of every activity on the WDW website that I printed off 4 per page so we could keep track of things we wanted to do.
it is an awesome bag whatever you call it whether fanny pack, backpack or purse. Well worth the money spent.