A lid for a drinking container includes a lid body, a poppet mouthpiece and a resilient sealing member. The lid body defines a longitudinal axis and includes an outer surface with a vent hole. The mouthpiece seals against a first inner surface of the lid body via an annular seal ring. The mouthpiece is movable between a closed position and an open position to allow fluid inside the container to flow through the mouthpiece. The sealing member is fitted on the lid body to sealingly engage the lid body to an open end of the container. The sealing member includes an annular flange sealingly engaging a second inner surface of the lid body. The flange includes a groove that defines a location on the lid where ambient air flowing into the vent hole can enter a container interior as fluid flows out of the container through the mouthpiece.