The perfect wake, the perfect surf and the perfect shape; the FatSac Pro X Series V-Drive Wakesurf Ballast Bag makes all three easy to obtain. The Pro X Series V-Drive Wakesurf Sac fits perfectly in the compartment of your v-drive boat to produce a nice wake for surfing. Try combining this sac with the Pro X Series Fat Brick to help you control the shape of your wake. It will also conform to fit in other places and in other type boats.