AVolta

All good suggestions! My only addition is a spare tube along with a patch kit. Once I ran over a staple and one patch was not large enough to cover both holes, but I couldn't use two patches because the holes were too close. Another time my brand new spare tube was defective. Thus my protocol for flats on long rides is to use the new tube but patch the flat and use the patched tube as a spare for the duration of the ride. BTW, I used to carry a CO2 pump until one time it blew out the cartridge when I was loading it. Since then I recommend carrying at least two cartridges - but after that experience I just use a manual pump. Over the years I have had to use a chain tool only once, making it worth carrying, and hex wrenches on numerous occasions.