It consists of a barrel-shaped container which holds the water and can roll along the ground, and a handle attached to the axis of the barrel. The drum of the Hippo water roller is made from UV stabilized linear low-density polyethylene and is designed to cope with the rough surfaces found in rural areas. The drum’s volume is 90 liters (about 24 gallons). It has a large opening (135 mm / 5.3 inch diameter) for easy filling and cleaning.