As most of my riding is limited to intra-city commuting (on bus routes) or on bike paths, I have not really faced a dire need for a repair kit while riding. I am looking into pulling off a three hour ride soon (one way, and then back two days later) and would like an idea of what to pack for emergency repairs while riding.
As I will have camping gear with me I am looking to have a minimal amount that can fit on my back. However, getting stranded two hours into the ride doesnt sound like fun and, aside from flats and a broken chain (?), I am not sure what else to prepare for or what to bring.
What emergencies should I prepare for? Are there repair kits already assembled (I have an old Ross road bike)? And what size pack am I likely to need?