Instruct: Classify Amazon reviews into positive or negative sentiment
Query: worst milk storage bags ever

So I'm currently taking care of my 4th kid so I know a few things about freezing milk. We've packed a freezer full of milk for 4 kids now over the past several years.Problem with these bags - when dunking a bag of frozen breast milk into hot water to thaw it out - the bags rip - a small hole will inevitably leak out milk. Its happened about 70% of the time out of the last 30 bags I've had to thaw.Absolutely ridiculous. How hard can it be to make a milk storage bag? The plastic needs to be thicker.