CALDWELL MAGNUM EXTENDED HEIGHT REAR BAG FILLED - SKU: CALD-MERBF This innovative, high-quality leather and polyester Rear Shooting Bag 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. Magnum Extended Rear Bag: for use with extended height shooting rests Unfilled bags should be filled with dry silica sand or other inert fillers