Purchased in 2021 at Akachan Honpo. I rarely used baby bottles, so I didn't use this much either, and it was stored at home for a long time. Sterilization in the microwave is not recommended, so it is at your own risk, but it was very easy and convenient. All parts are included. Please note that this item has been used and stored for a long time, and I apologize if I have overlooked anything as I am a private seller. Thank you.