Another water bag people use is a reynolds oven bag cut down to hold one liter. It can pack down small. I just bought tic tacs to see what I could get into it (for hiking out after losing pack scenario) and settled on fire, hydration and navigation stuff:
fire- matches/striker, trick candle, tinder
hydration- container (gerber milk bag holds 6 oz), aquatabs, straw
navigation- compass, led light
Separately, I might carry a thin garbage bag (or emergency poncho) to use as rain gear. I saw a video interview with a Grand Canyon ranger and that is what he carried in his pocket…a plastic bag of some sort.




