Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Bad container design.. Crack and leak!

The vacuum seal concept is great. It allow me to save left over much longer. But all the hard plastic containers are badly design. All of my containers (various shape and size) failed within four months of usage. All of them develop cracks. The bad thing about it, Food Saver does not sell the container by itself. You have to buy both the lid and container together. The only container that can withstand the usage are those soft plastic lunch containers. I guess softer plastic allow it to flex and withstand the force of vacuum better... Food Saver should design better containers..