Barefoot International Pro X Series Fat Sac Constructed with a white water rafting material called Valmex.Dimensions: 50 x 20 x 20 Weight: 750 lbs. Unbelievably durable and no longer need the support of an outer shell. Quick Connect Valve system making filling and draining these things an easy task. Our valves makes it possible to daisy-chain them to create the perfect integrated ballast system. Available in assorted colors to customize the look of your system.