Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Defective

Like a previous reviewer I got a defective product. As soon as I filled the bottle with hot coffee the entire container became hot. Four hours later my coffee was cold. Not just cool, but cold. There must have been a hole somewhere in the outer shell because there was absolutely no insulating effect provided. The cap also sat slightly at an angle so even if the bottle had been intact I question its ability to work properly. You would think a company as well-known as Thermos would have flawless quality control but apparently not.