I like to go bagless.
I travel light in the parks - well, as light as a 275lb guy can travel - and don't even stop for those bag check lines at the entrances. I carry no spare lenses, no camera bags (no bags of any kind), no full-size tripod. But I have lots of little stuff, which, after 19 trips since 1990, I have devised various non-bag methods of comfortably and conveniently dragging it all around the parks with me.
Front View:
Back View:
Pockets:
-LF
* cash & Disney Dollars
* breath mints
* PenAgain
* business card case with CM appreciation cards and tip cards
-RF
* car keys
* pocket knife
-RR (all stuff in the RR pocket goes into a plastic organizer box that I made)
* 2 Walgreens disposable hand wipes
* tiny bottle of contact lens re-wetting solution
* Chapstick
* roll of Roll-Aids
* USB flash drive
* 2 packs chewable Pepto tabs
* 3-compartment pill box with ibuprofin, Prilosec, Imodium, Drixoral, and Zyrtec
-LR
* Card case with various ID, ATM, credit, health insurance, car insurance, etc cards
* notebook for trip notes