Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Lousy Bags

I saw these on sale so I thought I would try them. Wow...what a mistake!! They are too thin, leak easy, and don't seal properly. I use the Lansinoh bags and have much better experience with them. I especially like the double zipper on the Lansinoh bags; gives me 'warm fuzzies' to know I successfully closed the bag. The milk it too valuable to risk leaky and inefficient bags. I won't try other bags anymore...Lansinoh all the way!