I have never actually seen a CO2 pump in action before.

How do you guys say they compare to an actual hand pump.
And where do you keep it? in the bag or on the frame?

Another thing is that I have two frame mounts and one of them has a water bottle and the other has a frame pump.
I have thought one of those mini pumps that attach to the water bottle cage so I can add another water bottle in the summer.
But I really like a handpump with a hose and gauge and not sure they make one small enough to fit on a combo cage.