Instruct: Classify a given Amazon review as either positive or negative.
Query: Sleek and shiny, but not leak-proof

The thermos is stylish and definitely keeps my coffee hot for a four or five hours. My problem? The top! I have so many problems getting the primary top to screw into the thermos properly. Invariably, it goes in crookedly and allows coffee to spill. I try and try...what's the trick?!?! Eventually, I give up and screw on the cup. Liquid won't leak out with both tops on, but when I arrive at work and take off the cup, coffee dribbles down the side from the improperly tightened lid. Definitely disappointed.