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This is the Best Travel Mug 2020 I have ever owned. bottom line: lives up to its promise. I actually forgot this mug in my office before a meeting and when I came back for it six hours later the coffee was still STEAMING. Bewildered by some of the negative comments… Why invest the time to log on to Amazon and complain but not take 67 seconds to read the enclosed instructions?? The rubber on the lid tastes funny? Wash the lid with soap and water before first use… AS INSTRUCTED.