It's kinda okeyish, but I wouldn't recommend this.
The bag looks like it will fit Medela pump, it is in any case comparable capacity, can hold at most 150cc. What I don't like is that you need scissors to cut the sealing, otherwise you risk tearing off the closing strip. Further, the label: you have to write on the piece of plastic that holds milk. Either you risk damaging the bag with a rollerbal pen, or, if you're using a permanent/CD marker, think about how much of that ink will penetrate through the plastic. I ended up writing in the corners.
Instead of this, I highly recommend Lansinoh, bigger volume, perforated tear-off safety-strip, matte roller-ball friendly label area on the neck and not on the body. And of course, double zipper.