Dont' scream, but I do not carry a pump. I just purchased a spare tube this weekend. My handpumps too bulky and I don't want a frame pump unless it has a gauge on it (very important-you don't want to blowout your tire).

It depends on what your confident in using. Cartridges are convenient, but caution with storage so you don't break the seal. Air's good, cause it's not as heavy in your tire and you get a work-out. If you have presta valves (very skinny) tubes PLEASE carry a converter. These valves are fragile and break easily. The brass valves only cost a $1.

I went looking for pump straps today to that I'm not living so dangerously.