I bought these because Gerber is a known and trusted brand. I previously used the medela ones.So many of these bags have leaks!!!! I check for leaks before putting the bags in the freezer and at first I thought the first leak was a fluke, but now I can honestly say one out of every 3 or 4 bags have had a leak, I won't even bother testing them, as far as I'm concerned, it's not worth the little money you save. You can't buy breastmilk and with these bags it goes to waste!!!It's back to medela for me.