ANd ComplIANCE soCial sustainability nEDBank founDation projECTS hIppo wATEr rollErS designed to hold up to 90 litres of water, the hippo water roller is a large reinforced drum with a metal handle, which allows it to be pushed or pulled over various types of terrain – making it far easier for rural community members to collect and transport large volumes, but make fewer trips to the water source.