The Area 419 Cole-Tac Rail Changer X Shooting Rest Bag was specially created as a lower-profile support pad for the RailChanger X system. It contours the bag and provides a solid base on barricades without adding a lot of overall height to your rifle system.Made of a combination of 500D and 1000D Codura and filled (fill volume is externally adjustable) with a special blend of poly beads and sand-like material, these are a great option for someone wanting a more minimalist approach to the RailChanger X.