Tetra Pak milk is made from ultra high temperature (UHT) treated milk, which is heated briefly to preserve taste and nutrition, allowing for a shelf life of 4 to 6 months when sealed. Unlike pasteurized milk, which has a shorter shelf life and requires constant refrigeration, UHT milk does not need to be boiled and maintains its nutritional properties. Benefits of Tetra Pak milk include longer shelf life, minimal refrigeration needs after opening, and avoidance of healthy bacteria loss.