This is an inner bag for baby bottles. There are 19 bags in the package, which originally contained 20. I am selling these because I have stopped using formula. I relied on these a lot while I was using formula. They were very helpful because they reduced the amount of luggage. Unused. They have been stored in a clean condition, but please consider this a used item. I am also selling on other sites, so it's first-come, first-served. Thank you.