FATSAC V-drive Wakesurf Fat Sac Ballast Bag - 400lbs - Gray [W713-GRAY]V drive Wakesurf Fat Sac Ballast Bag 400lbs Gray The FatSac V Drive ballast bag is a perfect option for mid size ballast bags. As FatSac's most versatile sac, the V Drive Fat Sac can be used nearly anywhere in the boat. Place it in the bow, the walk way, on a seat, beside a seat, or in a storage locker to enhance the wakeboard or surf wake behind your boat. The V Drive Wake Surf Sac is the same bag that is sold in a pair as the W701 Series of ballast