These Caldwell Universal Deluxe Rear Shooting Rest Bags are constructed of high-quality leather and Cordura construction. The traditional leather top surface provides a smooth, non-marring rest, and the Cordura sides will not stretch or sag to maintain the bag's original shape. Material: Top Grain Cowhide and Cordura Nylon. Dimensions: Base = 7-2/5" long x 5-1/3" wide, and 2-9/10" high. Ears = 3-2/3" long x 2" thick x 2-2/3" high. Weight Unfilled: 1/2 lbs. Works well with Caldwell Rock Deluxe Front Rest as well as Wichita, Hoppes, Sinclair, Hoene's, SYG and most other mechanical front rests. Base and 2 "ears" are separate compartments that need to be filled individually. Furnished empty to allow shooter to fill to their own preference. It will take approximately 2-1/3 lbs of media to fill this bag.