A portable sawzall could be a life saver to someone who is trapped in a collapsed house or mobile home. One 5 amp hour battery can run a saw up to a half hour for example. Vacuum sealed bags can carry a bunch of clothing and blankets untainted just by one rider. There are many pop up tents that bikers camp with, and all types of portable heaters. There are portable trench diggers to run lines, augers that can dig post holes, water pumps that can pump 75 gallons in 5 minutes and all types of filtration systems. The list goes on and on. Put some energy into it and you'd be surprised what can be accomplished in a short span of time.