Originally Posted by Fat Hack

Zefal HPX frame pump [up tp 160psi (it says it on the box)]
Tire levers, spare tube and a puncture kit.
You might wanna carry a couple of Allen wrenches also. I carry a 5mm one, because there's about 10 5mm bolts on a bike, and I can also adjust my seat height.

Most guys also carry a few bucks and a cell phone.

Carrying much more starts to get too heavy, which kinda defeats the purpose of buying a fancy bike in the first place