A receptacle, particularly a closed plastic ampoule produced in a blow molding method and filled in the mold, has a sleeve-type neck part (1) connected to a receptacle body (3) as an axial extension. The neck part forms a seat (11) for a pre-shaped insert (5) and is integrally molded in the mold onto a circumferential surface (9) of the insert (5). The circumferential surface (9) is equipped with at least one surface irregularity (21) having an enclosed base surface such that, due to the integral molding of the neck part (1) onto the circumferential surface (9) of the insert (5), a positive fit is present between the insert and the neck part (1). The fit forms a fixing element. The axial extension of the base surface of the surface irregularity (21) is only a small fraction of the axial extension of the circumferential surface (9).