The FatSac Fillable Weight Bag is a versatile ballast solution designed to give riders more control over their wake setup. Built for flexibility, this bag can be filled with water, sand, rocks, or other materials to customize weight based on your needs. When filled with water, it provides a solid 50 pounds of ballast to help shape a better wake for riding. The simple fill design allows you to submerge the bag or connect it to a compatible pump for quick and easy use. Once your session is over, it empties just as easily and folds down for compact storage. Durable and reliable, this fillable bag is a convenient option for anyone looking to fine tune their boat performance.