The shelf life of Yili pure milk varies according to the different packaging methods. For the boxed version, the shelf life is 6 months under sealed conditions at room temperature. This kind of packaging adopts sealed box, which can effectively isolate the outside air and light and prolong the shelf life of milk. The bagged version has a shelf life of 28 days and needs to be stored in a cool and backlit place. Compared with boxed milk, bagged milk has a thinner package and is easily influenced by the external environment, and its shelf life is relatively short. When storing milk, attention should be paid to avoiding direct sunlight and high temperature environment to maintain its freshness and quality.