Breast milk storage bags made from 100% new plastic pellets, safe from phenol. Gamma ray sterilization with the same system as medical devices. Ensure cleanliness and safety for the baby. 2 layers of laminated bag texture and resistant to ice crystals. Does not tear or leak easily PA-Free, made from 100% new plastic pellets, safe from phenol. Strong Seal Side seal and bottom of the bag are durable to support the expansion of milk while freezing. Food Contact Grade Bags and printed colors are certified to be food safe. Self-standing Bag - The bottom of the bag is convenient to pour milk and store. Wide Space Message Memo Bar Wide area, convenient for recording date and time Air-tight Seal Zipper Leak Proof, ensuring no leakage. The zip closes tightly in one go. Prevents the ingress of air well. GAMMA Sterilized - sterilized in the same system as medical devices. Ensure cleanliness and safety for the baby. Freezer-Safe Laminated bag made from 2 layers of film, resistant to ice granules and temperature -20C, not easily tear or leak.