Hot beverages may be too hot to drink, with temperatures often nearing the baking locus of water. The thick walls of a archetypical mug will absorb much of this calidity when the liquiform is first poured into the mug and so lower the beverage closer to potable temperatures.

A travel mug is a variation on the traditional mug that is better for transporting hot liquids. It may or may not be a vacuum flask, but is usually well insulated and completely enclosed, with an easily Photo Mugs closed opening on the top.