A hollow vacuum packaging product in which a ring includes threads distributed around its periphery, and between which a sealing cap enters into engagement when the hollow product is opened/closed. In an evacuated closed condition of the hollow product, the sealing cap is configured to enter into engagement only in an interval between two consecutive threads, or in plural such consecutive intervals, but not in all of the intervals. Such a hollow product may be, as an example, a thermoplastic bottle or jar.