Let's see...my bag contains:

-2 spare tubes
-tire levers
-multi-tool (Alien XS)
-Emergency gel (don't like them, so I'm not going to be tempted to use it unless I actually need to!)
-small notebook + pencil
-a couple doses of benadryl (in their individual blisters)
-CO2 inflator plus at least one cartridge
-bandaids of varying sizes
(to add--antibiotic ointment, a few doses each of ibuprofen and Tylenol, another gel, a few dollar bills)

My wallet, shot blocks and phone fit in my jersey or Camelbak pockets.