I'm always looking for cheap target ideas! Thanks for the info.
Not sure what the material is called, but I found some large bags made out of a plastic woven burlap type material. I went to a local plastic bag manufacturer and bought a case of plastic grocery sacks, stuffed as many as possible into the large plastic bag and sewed the top shut with string. Works great, stops field points right now, and easy to remove arrows. When the outer bag wears out, just transfer the inner stuffing into another one and you are ready to go.