US Patent 7048137 Drinking container with multilayer leak-proof closure

A drinking container comprises a bottle and a permanently leak-proof closure. The bottle is formed with contours that facilitate grasping by a user and has an opening sized to facilitate placing ice cubes into the bottle. Graduations on the sidewall of the bottle provide an indication of the volume of fluid within the bottle. The closure has threads configured to engage corresponding threads on the bottle and has a seal ring for sealing the liquid contents within the bottle. The closure further includes a lobe having an aperture.