I-De-U !! For breastfeeding mothers it's just perfect! No more spending time to clean and sterilize jars of preserving milk! And unlike working on some pots, this will really make good reserves in advance to anticipate the resumption of work. Another advantage, it only takes up very little space in the freezer (for me, I freeze flat, which then allows to really maximize storage space). In a water bath that is warming faster than in a pot or in a bottle. In less than a minute the milk temperature! Another plus, the label portion to rate capacity, date and time! I have passed some to my sister in law who hung live! and besides, it really comes cheap! Great buy!