Sodis Bag

red dot: best of the best
red dot award: design concept 2008

design:

Zhang Chi

Using the natural resource of the sun, the Sodis Bag has been designed to help people in developing countries obtain purified, drinkable water in times of emergency.

The Sodis Bag provides a low-cost and effective solution for relief organisations to provide aid to large numbers of victims of natural disasters, especially those in developing countries. Its design enables easy usage, water transportation and water disinfection. Based on the “SODIS” method (of Solar Water Disinfection), the bag is filled with water and is laid in the sun for approximately six hours. The bag works by utilising the heat (>50°) and UV rays of the sun, which kill life- threatening germs in the dirty water.

The polyurethane Sodis Bag is distributed in pairs. The pair of bags has a combined volume of 16 litres, which is sufficient to supply a family of five with purified water for a day. A strap is formed when the two bags are joined together, making it possible to carry the bags over one’s shoulder. This strap can also be used as a handle for pouring.