I have many Born-Free bottles and after one year, I've noticed that over half of them (about 7-8 bottles) have started leaking. When I took the bottle apart to find the cause, I noticed that the rubber part of the ventilation system was torn. I've always carefully washed the bottles with a bottle brush after soaking them. I knew that it wasn't from mishandling them. I called Born-Free and they told me that it's common for that to happen after a year and that they could send me a one-time replacement of two vents, but I would have to pay the shipping and handling. Really? For a $10 bottle? I told them that for $10 I would expect to be buying a quality bottle and that I'll be buying a 3 pack of Dr. Brown's BPA Free bottles for $10 instead of paying $6.99 for each 2 pack of replacement vents. At the time that I had my daughter, Born-Free was the only BPA free bottle with a ventilation system and I feel that they took advantage of that with concerned parents.