my repair kit coincides with the remoteness of the ride. If I'm on a 6 mile city trail loop, where it is singletrack but you're less than 1 mile from the city at any given point, then my pack has my cell phone, some patches, pump, glue, multitool.

If the ride is a 2+ hour drive into the woods, followed by a 15+ mile ride in rough terrain, then my pack will include the above plus 2 - 4 tubes, food, lots of water, chain tool, first aid kit, gps, pocket knife, etc...

I used to get a flat on every other ride, then I got some tougher tires and slime tubes. No more flats.