Re: Lightweight rear bag ideas ...
I use something that I'm packing already so essentially I don't add any more weight or volume to my pack at all. My goretex bivvy sac/bag, when folded in thirds lengthwise (find whatever works for you), and tightly rolled from one end to the other, held with a couple of stout rubber bands (like come on bunches of broccoli in the stores) has the perfect about of firmness/height for me. I shoot better groups off the bench (which I try to do as little as possible) with it and a bipod than I do with sandbags front and rear. Hope this helps. No extra weight...no extra bulk.
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