Similar to a vacuum flask, a commuter/travel mug is usually well-insulated and completely enclosed to prevent spillage, but will generally have an opening in the cover through which the contents can be consumed during transportation without spillage.
Mugs with inner and outer wall but not vacuum treated is generally called a double wall mug. Usually stainless steel will be used for the inner wall while outer wall can be stainless steel, plastic or even embed with other materials.
Our recommended commuter/travel mug are :
Thermos Vacuum-Insulated Travel TumblerOur recommended commuter/travel mug are :
,
Thermos Nissan Stainless-Steel Backpack Bottle
, and Contigo Autoseal Kids Trekker Cup
