Some of the areas that I varmint shoot are public land walk in areas. When we go to these shooting spots I carry a folding camp chair and a set of home made shooting sticks. Over the holidays I was gifted a Bog Pod tri pod. I am now in the process of converting a 1/2 inch piece of aluminum into a rest that will fit some of my rifle forend's better than the factory "V" rest. So my question is does anyone know of a good light weight filler for the leather forend shooting bags? I've already considered Styrofoam beads and dry peas/beans. Any other thoughts?