Better for your baby: 100% pure non-toxic platinum silicone is completely free of BPA, lead, PVC, latex and phthalates. They won’t leach harmful chemicals into your milk like plastics can. Made in the USA!Versatile: Zip Top milk bags are safe for use in the dishwasher (bottom rack too), freezer and bottle warmers. Pour corners to avoid spills and you can write on them! Easily organize by date in the freezer tray.Designed for easy use and cleaning: Plastic-Free, single-piece construction that stands up! The tops stay open and zippers do not overlap in the corners like normal zippers making it super easy to clean. Thick strong silicone will not tear or break.Better for the Planet: Endlessly reusable, Zip Top was designed with the environment in mind. After you are done nursing, these are great for toddler snacks or frozen treats!Milk Bag Set of 6 + Freezer Tray Includes: Six Milk Bags 2” x 3.9” x 5.9” (6 oz) + Freezer Tray. Easily store and organize breast milk by date in the refrigerator or freezer.