For commuting:
patch kit
Pedro's tire levers
spare tube
generic multi-tool
Leatherman Mini
Topeak Mini-morph
When pillaging:
Topeak Mountian Morph
spare tube
Craftsman strap wrench
mylar blanket
patch kit
Pedro's tire levers
flat roll of Duck Tape
Leatherman Juice
Rav-x multi-tool
Craftsman stubby combo/ratchet 15mm wrench
Craftsman 10mm wrench
small pedal wrench
pair of latex gloves
travel bottle of Gojo hand cleaner
bandaids
antiseptic pads
paper towels
assorted zip-ties
few feet of paracord
spare blinkies
Everything except the pump,tube,and strap wrench fit into a zippered neoprene bag about the size of a paperback. I carry more crap when out with my friends because they usually wind up needing it.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Dahon Speed Pro TT,Brompton S6L/S2E-X