1. Vacuum flask - This is one of the most accurate translations, referring to the vacuum insulation technology that keeps liquids hot or cold . The term describes both thermos bottles and vacuum-sealed containers in general.
2. Thermos- Interestingly, this term comes from a famous brand name that became genericized, much like "Coke" for cola drinks. Thermos originated as a German brand, was later acquired by Japan, and is now owned by a Taiwanese company. Many English speakers simply call any thermos bottle a "thermos" .
3. Vacuum cup - A more literal translation that emphasizes the cup form factor of many modern thermos bottles .
4. Thermal flask - Highlights the temperature-maintaining function .
5. Insulated mug/tumbler - Common terms for travel-friendly thermos cups with handles .
6. Travel tumbler- Specifically designed for on-the-go use .
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