Given the task definition and input, reply with output. In this task, You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

This tumbler keeps my hot tea warm long enough before I can I finish thanks to the double wall design. The metal straw and the metal ice cubes are so cute and functional. The size of the tumbler is perfect and fits my car beverage holder. Love it.
positive