A lid-container assembly (1,2) made of plastic material, wherein the container comprises: a bottom connected to a substantially cylindrical side wall or a cone trunk around a longitudinal axis; the side wall having an upper edge defining an access opening to the container; a first external annular strip outside the side wall provided with a first circular rib engaging the lid to the container; the lid in turn comprises: a central part and a peripheral wall that conforms to the side wall of the container, and comprises a second external annular strip that releasably engages the external annular strip of the container; the external annular strip of the lid, comprising an upper annular element that connects to the peripheral wall by an upper annular channel upturned U-shaped and at least one annular element below and connected to the upper annular element by means of a first circular tear line; and wherein facing surfaces of the external annular strip of the container and of the external annular strip of the lid comprise opposite engaging ribs; the lid-container assembly (1, 2) further comprises: a first interference sealing zone between opposite surfaces of the side wall of the container and of the peripheral wall of the lid; a second contact sealing zone between an upper edge of the container and the upper annular channel of the lid; a third contact sealing zone between opposite ribs of the external annular strips (10, 5) of the lid and of the container; characterised in that: the first external annular strip outside the side wall is provided with at least one second circular rib engaging the lid to the container. a bottom connected to a substantially cylindrical side wall or a cone trunk around a longitudinal axis; the side wall having an upper edge defining an access opening to the container; a first external annular strip outside the side wall provided with a first circular rib engaging the lid to the container; the lid in turn comprises: a central part and a peripheral wall that conforms to the side wall of the container, and comprises a second external annular strip that releasably engages the external annular strip of the container; the external annular strip of the lid, comprising an upper annular element that connects to the peripheral wall by an upper annular channel upturned U-shaped and at least one annular element below and connected to the upper annular element by means of a first circular tear line; and wherein facing surfaces of the external annular strip of the container and of the external annular strip of the lid comprise opposite engaging ribs; the lid-container assembly (1, 2) further comprises: a central part and a peripheral wall that conforms to the side wall of the container, and comprises a second external annular strip that releasably engages the external annular strip of the container; the external annular strip of the lid, comprising an upper annular element that connects to the peripheral wall by an upper annular channel upturned U-shaped and at least one annular element below and connected to the upper annular element by means of a first circular tear line; and wherein facing surfaces of the external annular strip of the container and of the external annular strip of the lid comprise opposite engaging ribs; the lid-container assembly (1, 2) further comprises: a first interference sealing zone between opposite surfaces of the side wall of the container and of the peripheral wall of the lid; a second contact sealing zone between an upper edge of the container and the upper annular channel of the lid; a third contact sealing zone between opposite ribs of the external annular strips (10, 5) of the lid and of the container; characterised in that: the first external annular strip outside the side wall is provided with at least one second circular rib engaging the lid to the container.