Fatsac V-Drive Wakesurf Sac 400lbFatsac V Drive Wakesurf Sac 400lb The Fatsac V Drive Wakesurf Sac 400lb is the most versatile single bag in the Pro X range. At 400lbs it's the same bag sold in a pair as the Fly High Rear Locker Set, making it a great standalone option for adding targeted ballast exactly where you need it. Place it in the bow, the walkway, on a seat, beside a seat, or in a storage locker to enhance your wakeboard or surf wake.