My tool kit (which I carry on all bikes whether it's road, off-road, touring or commuting) consists of
Tube to match tire size
Rima Tiptop patch kit with approximately 10 patches (I've used that many on rides before
)
Var Tire lever
Cool Tool (much better than current multitools
)
Sram power link in 8 and 9 speed (usually 2 of each)
A multisize spoke wrench
A Leatherman Squirt S
4 (scissors)
A Leatherman Squirt P
4 (pliers)
Extra 10-32 allen screws
Some duct tape
Zip ties
shock pump
A 16 penny nail (with a rock it works well as a punch for tightening loose bottom brackets)
A hypercracker tool for removing the cassette lock ring
When I tour, I also carry spare spokes for the freewheel side.
I have a first aid kit that I carry if I'm going a long way away from home but otherwise, I just use common sense and what is at hand for injuries.