Breastfeeding Essentials For Moms, by Moms Easy to Fill Super-Durable Leak-Proof Double Zipper Super-Durable Design Protects Your Breast Milk During Storage Pre-Sterilized and Ready to Use Easy to Fill and Freezes Flat Leak-Proof Double Zipper BPA-Free, Made from the Highest-Quality, Food Grade Plastic Milkies is committed to providing earth-friendly products. Milkies Breast Milk Storage Bags were designed by moms that know the challenges of pumping and storing milk. We created this storage bag with extra strong sides and a double zipper closure so your milk stays right where it belongs. Milkies Storage Bags also stand up so you can easily pour your milk into them without spilling a drop.