I received the Ameda Purely Yours pump as a gift. Are there any extra supplies I should get to have avaiablle, i.e. extra membranes? How interchangeable are the extra supplies? I'm guessing I can you any type of bag, etc? I don't plan to buy supplies until my LO gets here just in case I'm not able to bf, but I thought it'd be good to make a list and become more educated about what you need and what is nice to have.
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