2 billion people in the world do not have access to safe drinking water, resulting in 500,000 deaths yearly. SolarSack has developed an affordable and non-chemical household water purification solution. SolarSack can purify 4L of water in 4 hours using only sunlight. It is reusable 500 times, providing 2,000L of purified water for only $4 - enough for a family of four for an entire year.