The Philips Avent Breast Milk Storage Bag provides safe and secure storage for your precious milk. They're pre-sterilized for immediate use, and you can store them in the fridge or freezer. The sturdy design makes them self-standing.Self-standing, pre-sterilized Philips Avent Breast Milk Storage Bags can be store in fridge or freezer. Measures 6.4" x 4.4" x 1.8". Tamper-proof seal. Reinforced seams, dual layer bag. Secure, leak-proof double zipper seal. Wide opening for easy filling/pouring. Lays flat for easy storage. Made of BPA-free material. Imported.