Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The BEST!!!

As a mom of a 30 weeker preemie I have been and will continue to do a lot of pumping and storing breast milk. I started out using the bags that I got for free at the NICU, but they were such a hassle to try to seal them with a piece of tape.These are the best that I have found. They are the most expensive, but definately worth it. The NICU has a double bagging policy for all the milk that they use, but they made an exception for me since these bags work so well.They are so sturdy. They fill and pour easily. The plastic is very thick to prevent freezer burn. They have a double seal that prevents leaking.For me, breast milk is too valuable to be skimping on cheap bags. A great investment!