Abstract: A container includes a container body provided with a neck portion forming a circumferential opening, a removable lid operative for firmly closing the opening. The lid includes a cap body, an outer elastomeric rim circumferentially and outwardly projecting from the cap body. The rim comprises a lower annular portion operative to firmly engage the inner wall of the neck portion when the latter is in assembly with the lid, and an upper portion so spaced from the lower portion as to engage the outer upper surface of the neck portion when the lower portion is inserted all the way in the opening.