I made a pack out of plastic bags from the grocery store. cool It has two bags on the back, and two on the front and maybe a few for shoulder straps and tying it all together, maybe 7 bags, maybe 4, haven't looked at it in a while and of course I've never used it, but it weighs 2-3 ounces and cost nothing. Think how much gear you can carry in 4 plastic grocery bags, and you can get them on the way to the trailhead. goodjob
Jim grin
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.