For even more convenience, these pre-sterilized, BPA free milk storage bags from Spectra for quick storage of your breast milk and so much more. The Easy Milk Storage Bags can be attached directly to your Spectra Breast Shield and you can pump directly in them by using the Connector piece. Also you can feed the baby directly from them, all you need to do is attach the milk bottle head to it. And this is not everything, they are self-standing, so they can easily stand upright in your freezer, saving space. These innovative Easy Milk Storage Bags have temperature sensor and a lid closure, which assures a tight seal. A measurement scale on the front of the milk bag lets you see at a glance how much milk it contains.