My very favorite target for field points is a gunny sack stuffed with two old Coleman sleeping bags. Have never been able to get an arrow to even poke out the back side, and they pull with 1 finger and thumb! Probably wouldn't hold up outside on the wetside though, I use it in the shop during the winter and it spends all summer outside.
Gunny sack stuffed with T-shirts, or painter rags work very well also. (again for field points, and dry)