My father and I have built a workshop as hobby work area for piddling on trailers, tractors, bows, etc, and we have settled on the idea of using it to shoot during nasty weather and after dark. I was wondering what suggestions folks have for backstop material. Neither of us is likely to miss that bad on a regular basis, but things happen. Strings break, fletching peels off in flight occassionally, and so forth. Just wondering if anyone else did this and what some backstop ideas were. Thanks for any input!