Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Looks nice but leaks.

The first one I received leaks from the lid. It's just not a tight seal. I contacted the seller, who sent a replacement which had the same problem. The flask works fine as long as you keep it upright. The moment is lays sideways up upside down, liquid starts to seep out of the lid. Spend a few more bucks and get a better one.