I used to carry EVERYTHING until it got nicked........so decided not to do that anymore, even though i fitted an alarm.

Now i have:

Basic tool wrap, pliers + knife
Wheel nut spaner/bottle jack (and a piece of wood as the jack doesnt reach now its lifted)
Tow rope + shackle
Jump leads
straps/bungies
air hose + tyre inflator (run from the compressor tank)
Hi-Vis, first aid kit + tourch