Pros: Bags that can go in the freezer
Cons: don't hold a lot, leak
I lay my milk flat down in the freezer to get the most I can in a small amount of space. I found that these leaked. They also don't hold as much as other brands. Many moms won't mind this but I was trying to pump all of my oversupply in as few of bags as possible for babies in need and the moms would just thaw what they needed for the day all at once and store in the fridge until baby was hungry. I just don't think these are worth it.