Extra bottles are compatible with all Medela breast pumps, as well as calma, for pumping directly into the bottle Safe plastic made without BPA, designed to retain breast milk's beneficial properties Ideal for safe storage of breast milk in refrigerator or freezer Screw on lids for leak-proof storage, travel and freezing #Modernbabies #medela #medelaph #storagebottles #medelabottles #atorage #5oz #medelaph