Sidenote: I stock powdered and UHT milk for emergencies. I mean what could happen? There are cows nearby. Powdered milk in an unopened package may keep for 10 years, and unopened UHT milk can last up to a year. Powdered milk saves space. I just checked my stockpile. I have ten quarts of UHT milk and I have 10 boxes with 18 powdered milk packets that make 8 oz each.