Instruct: Classify a review into positive or negative sentiment.
Query: Good for home/office use

I chose the 18-oz tumbler particularly for the higher capacity, although a version with a leak-proof cap might retain heat better. I work at home, so I don't need to take this tumbler out. I assume one would have to always hold it in one hand or put it in a car's cup holder. Since it is not leak-proof it cannot go into a backpack of briefcase unless it is empty. I think it is ideal for use in the home or office, rather than during commute. Hot water/tea stays really hot for 1-2 hours. If hot liquid is left in the tumbler without frequent drinking, it will still be lukewarm for up to 6-7 hours afterwards. Note that the plastic cap does get warm and will transfer heat to the top stainless steel rim of the tumbler, but the bottom of the tumbler is always cool.