Instruct: Classify an Amazon review as either positive or negative.
Query: It's a plastic cup.

It's blue, it's stackable, and it's pretty sturdy. I have yet to have one break, warp, or crack so far and I've had some of them for years. They don't seem to pick up smells and they microwave fine (as far as I can tell). Not much else you can say about them, it's a plastic cup. :)