RotopaX FuelpaX Deluxe Pack Mount's unique design add strength and provide extra tightening power. These are not cheap injection molded plastic parts that will fail when you are 25 miles down the trail. The clamping part of the mount is identical to it's RotopaX DLX cousin, anodized aluminum, but the main difference is the base. The FuelpaX base is a lower cost alternative but with close to the full strength of the premium RotopaX line!