Title: Helpful for sealing Avent bottles.
Product review: This was the perfect addition to our bottle collection. I'm a breastfeeding mom who pumps for one bottle a day and am happy to be able to store milk in the fridge and then simply exchange these inserts for the nipple. Great purchase if you're using Avent bottles already. With that said, it advertizes that you can write on the lids... I'm not really sure how one would do this (with what kind of pen) and be able to reuse.
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