I have been using these bags for a month and haven’t had any leaks or issues. Switched from Medela bags and these are similar in quality for a much better cost. They are easy to store and thaw. They can be a little messy when pouring milk into bag from pump bottle because the flaps get in the way if you aren’t using a funnel. The adaptors are easy to use and work with my Medela In Style pump. If pumping directly into bag, the measurements on bag are not accurate, off by approx 1oz. Will definitely continue to use these bags.