Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Underwhelmed

After reading the other excellent reviews I'm convinced that I must not have gotten a real Timolino product - the one I received performs very poorly - it doesn't keep hot beverages hot for even 3 hours and doesn't keep cold very long either - less than 5 hours. (Even after letting it sit with hot/cold water first, making sure the pour top was closed and putting the lid on tightly.) Also mine holds 24 not 17 ounces. Having previously purchased 3 other Timolino products which were excellent this one is a huge disappointment. I should have returned it, but had all ready thrown away the box it came in.