text: These bags are not very accurate (or I just haven’t figured out how to open them all the way but....that’s pretty intuitive, no?). I pump into medela bottles and on my last pump I got 8 oz but when I poured it into the bag it was well above the 8 line. I usually use lansinoh bags but bought these because they are the only bags I found that hold more than 6 oz and I was tired of using two bags for one pump nearly every time. I just need to remember to measure before I pour