Mothers Milk Spectra Baby Spectra Disposable Breast Milk Storage Bags hold up to 7 ounces of breast milk. Spectra breast milk bags are self-standing, so they can easily stand upright in your freezer, saving space, and are double-lined and tightly seal-able so that you can be confident your breast milk is protected. Measurement on the front of the milk bag lets you see at a glance how much milk it contains. Now with temperature indicator!