Instruct: Classify a given review into positive or negative sentiment.
Query: very satisfied with this product

The 18 oz. size is very handy. Fits in my bookbag pocket, as well as my bike waterbottle holder. It is also very sturdy. It doesn't break when dropped, unlike some plastic ones I've had, and the water doesn't get that "plastic" taste. Based on scientific evidence that there are a lot of bad plastics out there, the stainless steel is a great alternative from a health standpoint. I also ordered the sports cap, a nice addition.