We have a lot of animals … so we get a lot of Chewy boxes. The box I was using wasn’t deep enough and I was getting a lot of bounce-outs. This weekend I cut the bottom out of my old one and slipped it inside this new shiny one now it’s 23” deep and I get very few bounce-outs. Used fender washers to protect the cardboard from ripping. Threaded rod to hold the back stop and eye bolts and an s-biner for the string. Works a dream!