Originally Posted by Semisane

As the other guys have said, old tube socks filled with sand or rice works very well. I like sand better if you don't have to carry the bags too far. Rice is a lot lighter.

Here are a couple of suggestions. If you use sand, put one of those plastic grocery bags in the sock, then fill it with sand. Tie of the plastic bag with a piece of string, then tie off the sock. You might try constricting the center of the tube with a piece of string also, so to make them look like a bow tie. They hold the gun a little better that way. Also, get yourself a piece of old carpet and cut a bunch of ten inch squares to put under the sock bags. You can add or subtract carpet squares from the front or rear bag to adjust the hold exactly the way you want it.