Abstract: The present invention is directed to a lid for use on a drinking container. The lid is capable of being releasably sealably engaged with a top end of the container. The lid can be secured to the container in a manner to resist displacement of the lid if the container is dropped or tipped. The lid includes a tab portion, which is capable of being depressed by a user's mouth, tongue or lip so as to provide an opening in the lid. The tab portion is also biased so as to return to a closed position to close the opening upon removal of pressure against the tab portion. The tab portion can have a perimeter larger in at least one dimension than the opening to resist fluid discharge when in the closed position.