Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Nice compact thermos..

This Nissan stainless thermos is just the right size and easy to carry in a bag. It maintains the temperature of my hot/cold beverages for hours. However, I wish the sip lid and cap were either made with higher quality plastic or stainless steel. I've owned it for a few months already and can still taste the plastic when I'm drinking hot liquids.