Most Americans take clean water for granted. For many in the developing world, however, getting access to water can be a daily, backbreaking struggle. That’s why South Africans Pettie Petzer and Johan Joker created the Hippo Water Roller, a simple water-collecting device with a broad social impact. While the average adult woman can only balance a full 20-liter bucket of water on her head at a time, the Hippo Water Roller enables anyone, young or old, to transport 90 liters of water thanks to a rolling barrel setup that can be easily pushed or dragged. Each barrel is made of sturdy plastic and has an expected lifespan of seven years, after which it can be repurposed for other uses.