1. Ideal for freezing breast milk: The sealing disc allow you to store or freeze your precious breast milk, without leaking. Please keep in mind that the sealing disc has to be used with the Philips Avent adapter ring in order to prevent leaking.
2. Write date on the disc for storage: You can write the date of expressing or freezing on the sealing disc. Easily organize your breast milk or baby food.
3. Philips Avent sealing discs are BPA free: Philips Avent sealing discs are BPA free Philips Avent sealing discs are made from polpropylene (PP) & thermoplastic elastomer (TPE), two BPA free materials.
4. 6 sealing discs to store breast milk or food: Easily store your milk and food in the Philips Avent bottle. Close the bottle with the sealing disc.

Convert Philips Avent bottles and cups to storage containers
Fit securely over the bottle to transport breastmilk, formula and other liquid
Track contents by writing directly on seal.
Keep in mind that the sealing disc has to be used with the Philips Avent adapter ring in order to prevent leaking.