A device for producing container products of plastic materials, particularly by carrying out a molding, filling and sealing method, includes a molding device (13) that can be supplied with a molding tube (15) of plasticized plastic materials and that has a movable molding surface (17), adapted to the predefinable geometry of the container. The molding tube (15) can be laid on the molding surface for a shaping, filling and/or sealing process. A guide and retainer device (25) includes movable guide and retainer parts (77, 81; 79, 83) able to be controlled to engage, outside the molding region of the molding device (13), on the molding tube (15) itself and/or on the plastic material that surrounds each manufactured container product and/or its container.