I've given up my old cardboard box with the hole cut in to catch brass for a new Caldwell Brass Trap. This is a mesh bag on two plastic hoops that attach to a steel base forming a standing mesh bag open on one (the large) end. Zipper across the smaller rear end for quick dumping the brass to another container. It's made from a heat resistant mesh material. Main reasons for buying this rig (besides a hatred for sweeping and sorting brass) is it packs into a compact bag for transport and it can be screwed onto a tripod and set at the right highth for a standing pistol shooter! It seems well made and pretty cool. Anyone have experience with one of these things?