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 .