Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Gives drinks an odd taste

The Nissan Thermos does an excellent job at keeping drinks warm. A cup of coffee will stay warm for at least 2-3 hours. However, the rubber seal near the top of the container (the one that seals the plastic top to the metal bottom) imparts an odor to all hot drinks. I've also found that liquid gets under the rubber seal making cleaning difficult. I don't use this product any more because of the odor.