X-Small Rear Bag is an ultra lightweight shooting bag that is ideal to use under the butt of the rifle when shooting prone. This bag helps aid the shooter to make minor verticaladjustments to your point of aim. Squeeze the bag to allow your crosshairs to decline release your grip to allow your crosshairs to incline. No More muscling the rifle to stay steady. The bag illuminates the cross hair wobble. Weight 6.4oz. Dimensions of bag is 5Wx7Lx3H