Thermos mugs

Thermos mug

— mugs with reinforced thermal insulation, which allows you to keep the temperature of the drink for a long time. However, such vessels are designed primarily for ease of use “on the go”, and not for long-term storage of the contents (this is how thermos mugs differ from thermos flasks). The design of thermo mugs often provides for valves or drinker lids (see "Opening / serving") that allow you to drink without opening the lid. Models with twist-on lids are somewhat less common — they retain heat more reliably when closed, but lose it faster when drinking. The capacity of all thermos mugs, naturally, is small — usually up to half a liter.