Abstract: A mug that is normally too large to fit into a vehicle cup holder is fitted with a hollow base member that is appropriately sized. When the elements are combined, the resulting mug can be conveniently carried in a vehicle cup holder. The base member can be used to carry beverage accessories such sugar, sweetener, creamer, or tea or cocoa. It is also possible to store liquids in the base member, such as extra coffee if the user wishes more than the mug can hold. Gaskets can be used to prevent leakage and cover members can be provided to close the base member when not connected to the mug.