Instruct: Classify a given review as either positive or negative.
Query: These things are amazing!

Bought this as a gift for my sister, because I had a blue one(not lying, promise ;p). It's the most convenient water bottle there is, and you should stop polluting the earth with plastic and switch to a no-BP, comfortable, and easy camel-tube water bottle. The nipple-thing makes water drinking like...being born!