The main property of a thermos is to maintain the temperature of the liquid poured into it. Accordingly, the key parameter of efficiency is not so much the case material or some of its heat-insulating marketing chips, but the value of the water temperature after a certain period of time. So manufacturers, confident in the quality of their products, are happy to share their achievements. The temperature value after 24 hours shows how many degrees the boiling water poured into the thermos will cool (98 °C) at an ambient temperature of about 20 °. And with values of more than 50 °, a thermos can be considered one that
keeps the temperature for a long time.
The presence in the design of the thermos of
a special belt, which allows you to comfortably carry the container on your shoulder. This function is usually found in large-capacity models, primarily food ones (see "Type"): it is much easier to carry a weighty thermos in this way than in your hands, and it's more convenient — your hands themselves remain free. Most often, the shoulder strap is attached to the thermos itself, however, in some models, it may be part of the complete cover (see below).
