Patent ID: 8286826

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, 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; and a removable lid configured to enclose the interior cavity, the lid including a spout sized to be received within a human mouth and configured to dispense liquid from the interior cavity, a groove about its perimeter formed to receive the rim of the main body, the groove having an inner surface and an outer surface, and a second lip projecting from the inner surface of the groove into the groove, the second lip configured to form a seal with the first lip, wherein while the first lip and the second lip are engaging to form the seal, there is no substantial deformation of the groove, 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, and wherein an upper portion of the first outer surface of the rim is contoured substantially in the form of a curve and 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 container is in an upright position.