Abstract: A cup system including a lid, a liner, an outer cup, and an optional valve. The liner includes first and second mating surfaces. The liner first mating surface is selectively attachable to a corresponding mating surface associated with the outer cup and the liner second mating surface is selectively attachable to a corresponding mating surface associated with the lid. The mating surface of the lid is also selectively attachable to the mating surface of the outer cup such that present cup can be utilized as either an insulated or a non-insulated cup. The optional valve assembles to the lid by pressing the boss of the valve into a valve receiver associated with the lid.