I like that I can pump it straight into bags so I like them. However, I have found that there are still the same number of parts that need washing. You need to wash 2 flanges + 2 bottles OR 2 such adapters. In this respect, it saves me no trouble, except that I don't have to transfer the milk from the bag to the bottle. I also usually put milk from each breast into a separate bag. If you're the type that overproduces and needs to measure out more than the two servings you're pumping, all you have to do is pour some into another bag. On the other hand, if you are struggling with production and put both batches of both breasts in one bag, just dye the bag and end up washing the same amount of pieces. I would also like to warn you that the bags hang much lower than the small bottles that come with my pump, which can be uncomfortable. At the same time, bags can get out of your way a little more easily than bottles. While they're great for their purpose, they're not high on the list of things I would definitely buy again for pumping or even newborn care.
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