Fixing Punctures / Puncture Repair / Exploding Tubes

small multi tool, co2 canister, pump, tube, park patches, all fit in my jersey pockets.
seems odd that people go on rides with a bag when at most a small saddle bag is all you need.

The funniest bit is that the people carrying bags tend to leave out the actual useful bits of kit and have to borrow pumps, tubes, patches, glue oh and someone to show them how to change a tube..