It really depends on the distance.
The hard cores here need bar bags and saddle bags, I'll let them tell you what they carry (many of them are in France, being hard core)
I'm concentrating on centuries right now and in my camera bag turned saddle bag (ain't cable ties great!), I carry;
-hex set
-mini leatherman (scissors)
-two tubes
-three CO2 charges
-patches (yes I'm paranoid)
-plastic baggies for electronics
-money
-cable ties
-gum
-batteries
-SPF stuff
-electronic pressure guage
-as much candy as I can fit in the little room left.
Two bottles on the frame, two in my jersey.
Cell, mp3 player and sometimes beeper on my shorts.
Some sort of food in the third jersey pocket.
Wow, that seems like alot when I type it!