Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: NOT THE BEST BAG!

The Lansinoh bags worked better for me. They are designed with a ziplock closure method vs the twist tie Medela method. They store flat and thaw much faster in the refrigerator than the Medela bags. I have also had concerns over the use of unsanitary scissors to open the Medela bags and have experienced leaks. I have been pleased with the Lansinoh bags.