Take your wakeboarding or wakesurfing to the next level and increase your wave size with these Fatsac Water Ballast Bags. These bags can be plumbed in to factory boat systems or filled with our Fatsac Tsunami pump adding weight to your boat in minutes. They are constructed of Valmex, an almost indestructible material typically used on white water rafts. Fat Sacs Include 4 valves, one with a quick connect for the Tsunami Pump, one air vent, and two plugs on each sack.