Just offering more information on this bag that’s not listed: This bag is made from a highly durable waxed canvas with tacky/grippy feel. It’s somewhat stiff while new, but after some normal use, it softens and takes the shape of whatever support it’s rested on. It’s filled with small plastic pellets, so it only weighs six to seven pounds, where as a sand-filled bag would weigh approximately twice as much. It features two Rail Changer-X compatible connection points located on the top and the side of the bag. While it’s not connected to the Rail Changer-X and used as a rear bag, the connection panels are streamlined and pliable to not get in the way.