Abstract: One container lid embodiment includes a body and a cap pivotably attached to the body via a hinge assembly. The body has internal threads configured to engage external threads on a fluid port of the container. The body has an opening corresponding to less than all of an area of the fluid port. The opening, configured as a modified teardrop opening through the body, includes an arc portion adjacent a circumference of the body opposite the hinge in fluid cooperation with an elongate vent extending perpendicularly from the arc portion towards the hinge. The body has a lip adjacent to the arc portion of the opening, extending radially away from the opening. The cap is configured to seal the body when articulated in proximity with the body.

Abstract: One container lid embodiment includes a body and a cap pivotably attached to the body via a hinge assembly. The body has internal threads configured to engage external threads on a fluid port of the container. The body has an opening corresponding to less than all of an area of the fluid port. The opening, configured as a modified teardrop opening through the body, includes an arc portion adjacent a circumference of the body opposite the hinge in fluid cooperation with an elongate vent extending perpendicularly from the arc portion towards the hinge. The body has a lip adjacent to the arc portion of the opening, extending radially away from the opening. The cap is configured to seal the body when articulated in proximity with the body.