http://www.bestbabyfeedingproducts.com/harmony-manual/
Can i use the Dr. Browns Bottles with the Medela Harmony Manual Breast Pump?
I used Dr. Brown's bottles (they are the best!!!) and a Medela manual pump. If I remember right, the size of the opening at the top of the Medela bottles and the Dr. Brown's bottles were the same, so you could just screw the bottle right on to the pump. I'd use the lids from the Medela bottles to store it in the fridge sometimes. The nipple on the Dr. Brown's bottles was the only one my daughter would use and I was all about less dishes to wash 
Good luck!
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