The bottles would be great if they did not leak. I've bought 3 different packs thinking I bought a damaged pack, but they all leaked. At $15.00 for a pack of 3 I was very disappointed.. I have the older air vent bottles and they work great, I wish I could purchase more of those. I'm  out $45.oo and very upset. I will never purchase playtex bottles again and I would recommend that other mom's not buy this product. I wish I looked at this website before making my purchase. The playtex air vent bottles, both kinds are a big waste of money!!!