Medela Breast Milk Storage Bags are pre-sterilized, BPA-free bags designed for safely storing, carrying and warming breast milk. Each pack contains 25 bags with a 180ml/6oz capacity, featuring measurement markings and a secure double-zipper seal for leak protection. Key features: • Pre-sterilized and ready to use • 180ml/6oz storage capacity • Clear measurement markings in ml and oz • Double-zipper seal for leak protection • BPA-free materials • Space for labeling date and volume These storage bags are designed to lay flat for efficient storage in refrigerator or freezer. The bags include a convenient labeling area to note important details like date, time and volume. They can be used to collect milk directly from compatible Medela breast pumps or for transferring expressed milk for storage. The sturdy construction helps protect breast milk during storage and transport.