These 4 oz. emergency drinking water pouches provide critical clean water in a severe emergency or disaster. They are U.S. Coast Guard approved and have a 5year shelf life, reducing the need for replacement and lengthening the life of any emergency kit. Each pouch is extremely durable, compact and lightweight. The 4 oz. size provides important portion control for groups or individuals in an extended emergency. Pouches are easily opened. In an emergency, each person should drink a minimum of 8oz. (2 pouches) per day.