I have a 5 lb plastic container of buttermilk powder it in the freezer and use as needed. It is about three maybe four years old now and still good. I checked the price of it online and it very expensive from what I paid for this at Sam's Club but not sold there anymore. Sam's use to sell commercial baking products in bulk. I remember thinking when I bought it this sure is a lot but cheap. I'm glad I did buy it. Still using it when I don't have fresh buttermilk to use.