To preserve function of virgin seal from failing with a removed covering cylinder made unusable for reinsertion by a method wherein a plurality of elastic pieces extending outwardly downward are provided in projection at the lower end of a peripheral wall of the covering cylinder.

The structure is composed of a container body A for which a mouth-and-neck part 6 is held upright, extending from the upper end of a trunk part 1 through a shoulder part 2, and a first engaging stripe 4 is provided at the external face at the upper end of the trunk part, a cap B for closing a mouth part at the upper end of the mouth-and-neck part, a topped covering cylinder C for which a plurality of elastic pieces 7 extending outwardly downward from the lower end of a peripheral wall for covering the cap are provided with the lower end thereof placed on the upper face of the shoulder part 2 of the container body A, and a sealing cylinder D for which a second engaging stripe 8 unextractably fitted into a first engaging stripe 4 is provided at the inner face thereof and an inwardly extending inner end 10 extending inwardly from the upper end thereof is provided for contacting with the outer face at the lower end of the aforementioned covering cylinder C.