“…Joe’s auto-sealing Contigo mug wasn’t working properly. Moisture was
getting caught between the mug’s layers, causing leaks. When Joe wrote
to Contigo, he quickly received an unexpected reply from the mug’s
designer.”
Sometimes a company just “gets it”. Read the full exchange at: The Consumerist.com: Above And Beyond
The product seems very good except that the rubber gaskets need to be replaced and they are not easy to find.