I used these during my baby's weaning period. I no longer have a use for them, so I'm putting them up for sale. They have been sterilized. * Yellow portioning case: You can pour the prepared baby food directly into this case, close the lid, and freeze it. Once frozen, the food separates like ice cubes, making it convenient for frozen stock. * White case: Put the prepared baby food into a storage bag like a Ziploc bag, and then place it in this case. There are divider sticks, so you can separate the food into 3 or 9 portions, etc., and freeze them. This allows you to create frozen stock in the desired number of portions. I used both of these during my baby's weaning period. They were very useful. Stored at home. Please be sure to read my profile. I am also selling other baby goods, so please take a look if you'd like. I also accept combined purchases.