I always take a mini first aid kit (well maybe not so mini) that I make up myself around one of those mini J&J kits I get from the .99c store. I throw in some asprin/iubprophen, a few large band-aids, a tiny container of hibaclens and a roll of gauze and put it all in a small zip-lock (because the gauze roll doesn't fit in the little plastic box). I made up several of these and keep one in my Camelback for the MTB, and the other in my commuting seatpack.
Tzvia- rollin' slow...
Specialized Ruby Expert/mens Bontrager Inform RXL
Specialized SWorks Safire/mens Bontrager Inform RL
Giant Anthem-W XT-XTR/mens Bontrager Inform RXL
Fuji Newest 3 commuter/mens Bontrager Inform RL
Novara E.T.A commuter/mens Bontrager Inform RL