Abstract: A spill-protecting top on a drinking vessel with an opening at a suction spout for drinking fluid, with which a fluid passage between the opening and the drinking vessel is blocked by a closure body of a valve, which is pressed by a spring element against the scaling seat in the fluid passage, and wherein the closure body comprises a projection which with an actuation section projects up to in the region of the opening, and which presses the closure body, on actuation of the actuation section from the outer side of the opening, away from its sealing seat against the effect of the spring element by which means the fluid passage between the opening and the drinking vessel is unblocked.