A drinking cup comprising: an inner chamber disposed within an outer chamber and comprising an inner chamber volume defined by an inner chamber bottom and an inner chamber side wall terminating at an inner chamber rim; an outer chamber comprising an outer chamber bottom, an outer chamber inner side wall terminating at said inner chamber rim, and an outer chamber outer side wall terminating at an outer chamber rim; and a lower chamber having a lower chamber volume formed by said inner chamber bottom, said inner chamber side wall, and said outer chamber inner side wall; wherein said lower chamber volume is equal to said inner chamber volume or greater than and up to twice said inner chamber volume; and wherein said inner chamber is capable of nesting within an inner chamber of a second said cup when said cups are stacked. view more

The cup of claim 1 wherein said lower chamber volume is equal to or greater than and up to about one and two thirds times said inner chamber volume.

The cup of claim 1 wherein said lower chamber volume is equal to or greater than and up to about one and one half times said inner chamber volume.

The cup of claim 1 wherein said lower chamber volume is equal to or greater than and up to about one and one third times said inner chamber volume.