to a point immediately below the opening 32 of the lid 14 in the first embodiment a mounting plate 46 is provided on the end of the valve arm 44 and a flapper valve member 48 is secured to the mounting plate 46 and adapted to cover and enclose the opening 32 as seen in fig2 the dimensions of the flapper valve members 48 are larger than the opening 32 such that the opening 32 is fully enclosed by the flapper valve member 48 the valve mechanism 38 of the first embodiment further comprises an actuator arm 50 extending laterally and downwardly from the base of the lever arm 42 preferably a tab 52 is provided at the terminal end of the actuator arm 50 as seen in fig2 the valve mechanism 38 is provided on the lid 14 such that when the lid 14 is properly positioned on the rim 20 of the cup 12 the tab 52 of the actuator arm 50 is positioned closely adjacent the inside surface of the cup side wall 16 and the valve arm 44 is biased upwardly such that the lid opening 32 is closed by the flapper valve member 48 the rim 20 of the cup 12 is received in the recess 30 formed by the contoured flange 28 in this.