Ameda Mya Wide Neck Breast Milk Storage Bottles can be used to safely store expressed milk in the fridge or freezer. These storage bottles are breast feeding essentials and perfect for paced feeding. They are clearly marked to measure your milk, and have space for clear labeling. Works with Ameda locking rings and discs to seal the Milk collection container, helping to prevent spills. Please note: the Mya Breast Milk Storage Bottles are only compatible with the Mya and Mya Pro and will not work with the Mya Joy Milk Collection System Kit or HygieniKit.