Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Keeps drinks cold for hours!

The Contigo mug is my new favorite water bottle! It gave it a four star review because I have left ice water in it over night to find ice still remaining in the morning. It is also great because it does not leak. I ended up buying one for my husband too because he kept taking mine. I did take away one star because they do break easily. I dropped one on my kitchen floor and the top portion broke instantly. Maybe it was just my luck but I will be more careful in the future because they are a bit pricey to replace. Happy shopping!