Here is a 12-in-1 multitool that you can wear on your belt and use to get unstuck anywhere. The SOG Sync II has a compact design but works as a bolt/nut gripper, bottle opener, file, screwdriver, pliers, ruler, scissors, and wire cutter. It is designed to be worn with its detachable base as a belt buckle.
Sync II fits belts up to 1-3/4″. It costs $80 at this time.