Instruct: Classify Amazon reviews into positive or negative sentiment
Query: These bags leak!

I tried these with my first baby. About one out of every 10 bags or so will leak out the top, where the seal is. (The seal only has 1 zipper at the top.) I moved on to the Lansinoh bags, which a) never leak; b) are made of a little bit better plastic (I think); c) have a double seal at the top of the bag. Get the Lansinoh bags; don't even bother with these unless you are in a pinch and this is the only brand of bag available at the store. My second baby has benefitted from Lansinoh milk storage. Even using the Target in-store brand plastic bottle liners to store my milk with a twist-tie on top didn't produce leaks!!