We used to make gear bags out of old BDU bottoms. Cut the leg off, turn it inside out, sew the cut part shut, turn it right side out, and instant bag w/drawstring. Good little ditty bags.
When I used to shoot competetively, I used to use an old sock filled with sand as an elevation mechanism. In my prone shooting position, my offhand supports the rifle under the buttstock. By placing the butt of the rifle on the sock, I would then squeeze the sock to lower my scope, or relax it to raise it. I picked this neat little idea from a book somewhere, so it isnt mine-but I adapted it .