Ready formed. 8 fl oz each. Collapsible, flexible, pre-sterilized, disposable. Compare to Playtex Drop-Ins (This product is not manufactured or distributed by Playtex Family Products, Inc., owner of the registered trademark Playtex Drop-Ins). Top Care ready-formed bottle liners offer unsurpassed ease in feeding. They are simply placed into most disposable bottle holders and are ready to be filled. Top Care Ready-Formed Bottle Liners are specially molded without seams to ensure the liner collapses properly while feeding and reduces the chance of leakage. They are pre-sterilized and disposable so you get a clean liner for every feeding. Compare & save. Top Care: pre-sterilized; Playtex Drop-Ins: pre-sterilized. Top Care: fits most holders; Playtex Drop-Ins: fits most holders. Top Care: collapsible; Playtex Drop-Ins: collapsible. Top Care: economical; Playtex Drop-Ins: not economical. Quality guaranteed: This TopCare product is laboratory tested to guarantee its highest quality. Your total satisfaction is guaranteed. Made in China.