For my elk hunting mountain trips I have a gallon size ziploc bag that contains a few essential things that include a couple of trioxane fuel bars for starting fires, a zippo lighter(kept inside its own tiny ziploc baggie to contain the fuel vapors), a space blanket, trash bag that can be used as makeshift raingear, 100ft of parachute cord, a whistle and small signal mirror, a small sharpening stone, small folding knife, small tube of superglue, small roll of guaze. Also in my pack I carry a PUR filter and a water bottle or two bottles of water, and some food; jerky, snickers bar, dried fruit of some sort like apricots or raisins. Fleece sweater vacuum packed/compressed into a small packet. LED flashlight and a spare battery, compass, SPOT locater device. I have a gps but do not usually carry it.