someone needs to come up with a version of the military sleeping bag that was vacuum packed.nothing for super sub-zero,just normal hiking weather where you be out without a full pack of overnight camping gear.something like the foil sacks with enough insulation to keep you warm.and a real vacuum pack and not something done with a carpet cleaner.use one and toss.if you could get a bag like that into a Spam,or smaller,size can i would think it would be a life saver.what i really look forward too is a cell phone size PLB under $50