I use straw bales as targets, but compress them myself because I cant get to a TS easily. I use a ratchet strap lengthwise around the bale with a short scrap piece of 5/4 decking at each end for compression. Crank the ratchet down until the bale is very tight, then use the twine that is on the bale or cut it off and use another piece of just or nylon to retie the bale. I have one bale on top of another, sitting off the ground in a wooden rack. I hang a piece of folded-over carpet in the back, just to stop an arrow if I hit too close to the seam. But, I use the ratchet to hold the bales onto the rack, so even the seam gets pretty tight.