Bottle liners. Easy to insert. The curved bottom allows form simple insertion into holder. Ideal for breast milk storage. Can be used with all Playtex Nursers. Pre-sterilized for convenience and cleanliness. Contains ounce markings and space to mark the date and time you prepared the breast milk. 8 oz. Carded. Length: 3.75. Width: 4.75. Height: 2.88