Pros: double zips, easy to writeon surface clear measurements
Cons: no sticky loop to hook over pump and keep in place.
These bags are great...inexpensive compared to Medela and i love the double zip feature to make sure the milk stays where it is supposed to. I was using these with a Medela Pump In Style pump and so had to adapt the bags for that. I used blue painters tape (which I had handy) to tape the bag to the pump - not pretty, but very functional. They stayed in place well using that method - I didnt have any fails!
I like that the bag has clearly marked measurements and an easy to write on surface at the top!