Originally Posted by
PepeM
I recommend
this one. Incredibly small and has the basics. I'm sure someone will recommend something with spoke wrenches and chain breakers and torx keys and everything, but most bike related things can be solved with a few allens, which is what that one has.
I agree; I carry the version of this tool that clips to the bottom of my bottle cage. I carry a a tube, (2) CO2 canisters and an inflator in my jersey pocket.