Seal arrangement for a container closure

A container closure, comprising:

• a base member configured for attachment to an associated liquid container, the base member including a base wall having drinking and venting openings;
• a cover member removably connected to the base member, the cover member including a cover wall having drinking and venting apertures in selective registry with the respective drinking and venting openings;
• and
• a gasket interposed between the base member and the cover member and having an upper surface facing the cover member, the upper surface of the gasket integrally defines a first seal member surrounding the drinking aperture and a second seal member surrounding the venting aperture, each of the first seal member and the second seal member is substantially frustoconical shaped and is adapted to flex outwardly into engagement with the cover member in response to an increase in pressure within the associated container,
• wherein the base member includes a wall having a guide track extended about a circumference of the base wall, the wall and an upper surface of the base wall defining a floor region sized to receive the gasket, and the cover member includes an inwardly extending ledge sized for movable receipt in the guide track, the cover member adapted to rotate with respect to the base member via the ledge received in the guide track,
• further including a container seal secured to the base member, the container seal including a seal base and a seal sidewall extending downward from a peripheral edge portion of the seal base, the seal base adapted to sealingly engage an inner surface of the base wall, the seal sidewall adapted to sealingly engage the associated container.