Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Terrible Engineering

This is the first review I have ever made, despite ordering an average of at least $500 of products a month. Generally, I'm happy with the products I order. This is the exception. I wanted a durable, easy to clean water bottle. Technically, this design satisfies both of these criteria. However, when I filled it up with water and turned it over, it leaked like a sieve. There is a gasket at the top, but it was ineffective. I rarely return products, but I did return this one.