Birchwood Casey Shooting Rest Weight Bags 4 Pack. It is constructed of a heavy duty material to ensure the bag can withstand transport and use in the shooting rest. The bags are designed to fit horizontally or vertically in the weight tray to allow for an additional bag if necessary. Specifications for Birchwood Casey Shooting Rest Weight Bags 4 Pack: Manufacturer: Birchwood Casey Size: One Size Quantity: 4 Package Contents: Birchwood Casey Shooting Rest Weight Bags 4 Pack Birchwood Casey BC-SRWB-4PK: Shooting Rest Weight Bags 4 Pack BC-SRWB-4PK