i put water in it, i apologize by the way, i closed it, i turn it entirely, i was really seated underneath, i did not receive a single drop of water, it's keep water cold a little bit, sure it could handle Guinness ;-),for me it's good stuff
The lid does not seal, no matter how you insert it into the cup or turn it. The cup leaks (and leaks all over your face and clothing). this is not a good product, and I am hugely disappointed.