The Hydropower Bag can take your strength gains to a whole new level. Easily change stability level and resistance of your activity by adding or removing water. Includes removable handles that increase the functionality for Olympic-style lifts, curls and rows. Available in two sizes. Small: 29.5"Lx7"dia., holds 20kgs. (44 lbs.) water; Large: 29.5"Lx10"dia., holds 35 kgs. (77 lbs.) water.