FATSAC Open Bow Triangle Fat Sac Ballast Bag - 650lbs - Gray [W706-GRAY]Open Bow Triangle Fat Sac Ballast Bag 650lbs Gray The FatSac Series Open Bow Sac is triangular in shape and fits open bow boats. Place it up front and fill it for a huge improvement in wake transition and density. The shape of this sac allows the ability to fine tune the forward and aft weight distribution. The FatSac Open Bow Sac is triangular in shape and is designed to completely fill the open bow area. Place it up front and fill it for a huge