CALDWELL REAR BAG BLACK LEATHER UNFILLED - SKU: CALD-RBAG Rear Bags for use with Front Shooting Rests These innovative, high-quality leather and polyester Rear Shooting Bags function with most brands of front rests. The leather gives you a secure rest and the polyester, which will not stretch or sag, allows the bag to hold it"s shape. Standard Rear: for use with the 4" Center Post on the Rock and other similar rests Medium-High Rear: for use with the Fire Control Front Rest and other similar rests Magnum Extended Rear Bag: for use with extended height shooting rests Unfilled bags should be filled with dry silica sand or other inert fillers