Datrex emergency water pouches from Nitro-Pak are reliable and essential items to have in the event of an emergency. The 4.2 oz pouches are designed for both children and adults, and have a shelf life of at least 5 years. These pouches are easy to store and hand out during an emergency situation, and require no additional filtration or treatments. Simply drink straight from the pouch or freeze to use as an ice pack. Datrex is the only brand of emergency water pouches to be approved by both the U.S. Coast Guard and the International Coast Guard, and just might be the difference between life and death in a survival situation.