Bag disposable and expensive about 46 cts the bag. Convenient to the crib and especially to freeze up to 3 months! Practice also being able to write on a label that will be removed before Unload milk in the bottle; Do not thaw the milk in its pouch in the microwave but the refrigerator overnight (and other foods) or in hot water. Anyway this is very bad to heat the milk in the microwave (but that's another topic). These bags are solid, although stable. Small jars of the same brands seem preferable, they can be reused even when the child is weaned but may be less hygienic.
