Patent ID: 8807388

Claim:
A drinking container comprising: a main body defining an interior cavity that is accessible through an opening at an upper end of the main body, the main body having a rim about the upper end, the rim including an outer surface having an upper portion that is contoured substantially in the form of a curve, an inner surface defining a recess at least partially around the upper end of the main body, and a first lip projecting toward the interior cavity from the outer surface, wherein the uppermost portion of the first lip is positioned below the uppermost point of the curved upper portion of the outer surface of the rim when the main body is in an upright position, wherein a first diameter extends across the interior cavity of the main body between any two opposite innermost points of the first lip; and a removable lid configured to enclose the interior cavity, the lid including an opening configured to dispense liquid from the interior cavity, a groove formed to receive the rim of the main body, the groove having an inner surface and an outer surface, the outer surface of the groove having an upper portion that is contoured substantially in the form of a curve, a second lip projecting from the inner surface of the groove into the groove, wherein the entire second lip extends into the groove and a second diameter extends across the lid between any two opposite outermost points of the second lip, wherein the first diameter is less than the second diameter to provide an interference fit and one of the first lip and the second lip is configured to form a seal between the rim and the lid, and wherein one of the first lip and the second lip is defined by a variation in thickness between the respective outer surface and inner surface from which the lip projects.