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ThermosĀ®, Thermos flask; in the U.S., thermos bottle
1. A trademark for an insulated or vacuum container used to hold a liquid or food and to maintain it at a constant or original temperature.
2. Etymology: a trademark registered in Britain in 1907, invented by Sir James Dewar; patented in 1904 but not named at the time, from Greek thermos, "hot".

James Dewar built the first one in 1892, but it was first manufactured commercially in Germany in 1904, when two glass blowers formed the company Thermos GmbH.