I use a cardboard box from my favorite beer 12 bottle container, filled with junk catalogs that come in the mail daily. By the time it's shot up and ready to discard, I have the next one full. I tape two opposing sides with duct tape, just to hold everything firmly. The pellets don't go half through, so it's reversible. I have no idea how many shots I typically put in it, but it's a lot. I use targets with multiple aiming points, so the shooting is distributed over most of the box area. If an area gets too shop up, another layer of duct tape will hold it a while longer. It will finally bulge out a bit so that the surface is no longer flat, time to throw away. Great use for junk mail.