Pretty much my standard kit:

15mm open end/pedal wrench
bike multi tool
Leatherman
pump
tire levers
Park Tool glueless patches
spare tube
non latex gloves
1oz bottle of hand cleaner,wrapped in paper towels,in a baggie
anti-biotic wipes
couple assorted bandaids
zip ties
spare blinky light
piece of old mailing envelope(for tire booting)

Actually,I generally wind up using most if the other stuff for folks who don't carry anything.