Well kept freeze dried breast milk pouches can last 3 years when stored properly and produced to the proper water activity dryness. Freeze drying can provide extended life and make foods self stable based on findings by the USDA. There are many factors that affect storage times of freeze dried breast milk including fat ratios, temperature, exposer to UV sunlight and oxygen. Every BoobieJuice Pouch is made from a specialized triple layer, high barrier film that does not allow oxygen to pass and limits UV exposure. Make sure to inspect your pouch for punctures prior to opening. We recommend keeping your pouches in a cool, dark place, ideally in a room temperature environment below 80F and away from direct sunlight. Once open, please consume within 7 days. Well kept pouches can last 3 years when stored properly.