A closure device for closing a container, the closure device comprising: a ring comprising a first top wall and a flexible skirt extending downwardly from the first top wall, the first top wall defining a first central through-opening, the flexible skirt comprising a plurality of spaced-apart first legs, each of the legs having a first end at the first top wall and an opposing second end as well as an interior and an exterior surface,, a cover comprising a second top wall, a sidewall extending downwardly from the second top wall and an interior cavity defined by the second top wall and the sidewall, the second top wall defining a second central through-opening generally aligned with the first central through-opening of the ring; and a cap having a raised peripheral rim and a central depressed region, characterized in that the flexible skirt comprises a plurality of spaced-apart second legs, in that the plurality of spaced-apart first legs are different from the plurality of spaced-apart second legs, in that the interior surface of each first legs has a first inwardly protruding ledge between the first and second ends, in that the exterior surface of each first leg has a first outwardly protruding ledge between the first and second ends, in that each second leg has a second inwardly protruding ledge at the second end; in that the interior surface of each second leg has a flexible tongue and a recess configured to receive the flexible tongue; in that the interior surface of the sidewall of the cover includes a third inwardly protruding ledge, in that an interior surface of the central depressed region of the cap includes a plurality of spaced-apart bent tabs configured to be engaged in the second central through-opening of the cover to couple the cap to the cover, in that, in a first position in which the ring is least partially inserted within the interior cavity of the cover, the third inwardly protruding ledge of the cover engages the first top wall of the ring, and in that, in a second position in which the ring is fully inserted within the interior cavity of the cover, the third inwardly protruding ledge of the cover engages the first outwardly protruding ledge of each first leg of the ring. a ring comprising a first top wall and a flexible skirt extending downwardly from the first top wall, the first top wall defining a first central through-opening, the flexible skirt comprising a plurality of spaced-apart first legs, each of the legs having a first end at the first top wall and an opposing second end as well as an interior and an exterior surface,, a cover comprising a second top wall, a sidewall extending downwardly from the second top wall and an interior cavity defined by the second top wall and the sidewall, the second top wall defining a second central through-opening generally aligned with the first central through-opening of the ring; and a cap having a raised peripheral rim and a central depressed region, characterized in that the flexible skirt comprises a plurality of spaced-apart second legs, in that the plurality of spaced-apart first legs are different from the plurality of spaced-apart second legs, in that the interior surface of each first legs has a first inwardly protruding ledge between the first and second ends, in that the exterior surface of each first leg has a first outwardly protruding ledge between the first and second ends, in that each second leg has a second inwardly protruding ledge at the second end; in that the interior surface of each second leg has a flexible tongue and a recess configured to receive the flexible tongue; in that the interior surface of the sidewall of the cover includes a third inwardly protruding ledge, in that an interior surface of the central depressed region of the cap includes a plurality of spaced-apart bent tabs configured to be engaged in the second central through-opening of the cover to couple the cap to the cover, in that, in a first position in which the ring is least partially inserted within the interior cavity of the cover, the third inwardly protruding ledge of the cover engages the first top wall of the ring, and in that, in a second position in which the ring is fully inserted within the interior cavity of the cover, the third inwardly protruding ledge of the cover engages the first outwardly protruding ledge of each first leg of the ring. in that, in a first position in which the ring is least partially inserted within the interior cavity of the cover, the third inwardly protruding ledge of the cover engages the first top wall of the ring, and in that, in a second position in which the ring is fully inserted within the interior cavity of the cover, the third inwardly protruding ledge of the cover engages the first outwardly protruding ledge of each first leg of the ring.