This is for attaching a Pigeon Breastfeeding Real Feeling nipple and cap to Meiji Hohoemi Raku Raku Milk. It has been opened, but is unused. It was stored in a bag. As a bonus, if you'd like, a pouch that can be used to carry diapers, changes of clothes, etc. is also included ☺︎ When not in use, it can be folded compactly.