+2, I've tried a couple of different rests/sight vise jobs, and didn't like them at all. Plain old sand bags/shot bags/ whatever work the best. I've made them out of old jeans, old socks, shirt sleeves, they all work great. So do the commercially available bags. For a light field rest for my rifle, I've also used perlite or vermiculite from the garden store in some old socks. They worked pretty good too.