I still have several cans of powder in the 1lb metal cans that have a sticker on them that says $15.95. I don't know how old they are but they're old and the powder is still fine. I've actually used some of it recently without any issues at all. The powder has been stored in a good place and hasn't been exposed to the elements so maybe that has helped in keeping the powder in good shape. No doubt powder has a long shelf life.