Pre-sterilised: The Closer to Nature Milk Storage Bags come pre-sterilised so there’s no need to clean them before you transfer your breast milk into them Secure storage: The double fastened seal at the top of the bag ensures no precious breast milk leaks and allows you to store the bag both vertically and horizontally in the freezer without spilling Easy milk transfer: The Milk Storage Bags have a gusseted base that enables them to stand on their own, so it’s easy to pour breastmilk directly in without spilling Labelling: The label box on each bag allows you to document the name, volume and date of each pumping session so you can keep your fridge or freezer stash organised Baby-safe: The Tommee Tippee Closer to Nature Milk Storage Bags are BPA and BPS-free for total reassurance