Playtex Baby Drop-Ins Liners, 8 fl oz, 150 Count Perfect Fit for 8 oz Bottles: Specifically crafted to fit snugly inside your Playtex Baby 8 oz bottles. Reduces Air Ingestion: The liners are designed to collapse as baby feeds, reducing the intake of air and decreasing the risk of gas and fussiness. Pre-Sterilized for Safety: Every liner is pre-sterilized, ensuring a clean feeding experience for your little one.