Well of course a nice catchbox is essential to recycle ammo but all you really need is a couple old t-shirts, towels, or blanket/sheet hung up by the upper edge and hanging loose as a back drop. You won't shoot through it unless your shooting sharp corner "cube" or sections of cut threaded rod or rerod. Then sometimes it'll rip it up. Charles over on theslingshotforum.com has a tutorial for a pvc pipe frame setup that collapses into a plastic tote bin for portability. Nathan Masters also made a video about his thats a tote itself with a towel hanging inside. Joerg actually shot a hole through the bottom of it with his record monster. Check out the video if you havn't, quite funny when he's poking his finger in it
