BLACKHAWK! Sportster Shooting Rest Weight Bag, Large Unfilled Shooting rest weight bag Constructed of durable 600 denier polyester Compatible with BLACKHAWK! sportster and other Shooting rest trays Convenient carry handles for easy Transport Heavyweight zipper Unfilled shooting rest weight bag Constructed of durable 600 denier polyester Compatible with BLACKHAWK Sportster and other shooting rest trays Convenient carry handles for easy transport Large (74SB03BK) holds approximately 20 lbs. of sand or other desired media