Fastening ring (1, 8) for fastening a pouch in a container made up of a bottle (41, 42, 43) provided with an upper opening closeable by extraction means optionally mounted on a cup, wherein the ring is provided with - a first portion called cap (11, 81) provided with an upper tubular portion (111, 811), preferably cylindrical, whose lower end is partially closed by a bottom (112, 812), and provided with an outwardly projecting flange (113, 813) dimensioned to bear against the upper opening of the bottle and to be clamped between the upper opening of the bottle and the outer edge of the extraction means or the outer edge of the cup equipped with the extraction means during packaging of the container, - a tenon (13, 83) for fastening anti-collapse means (6, 6', 9) or an immersion tube, wherein the transverse cross-section of said tenon (13, 83) is smaller than the transverse cross-section of first portion (11, 81), - which first portion (11, 81) is extended from the bottom (112, 812) by an eyelet (12, 82) provided between the upper tubular portion (111, 811) and the tenon (13, 83), wherein the transverse cross-section of said eyelet (12, 82) is smaller than the transverse cross-section of first portion (11, 81), which eyelet is provided on its outer surface with a portion (12, 82) for fastening the pouch and bears fins (121, 821) disposed opposite one another relative to the central axis of said portion (12, 82) for fastening the pouch, characterised in that - the flange (113, 813) is located on the upper end of the upper tubular portion (111, 811), - the tenon is positioned in the extension of the upper tubular portion, on the side opposite to the flange (113, 813), - a central channel passes right through the ring from the flange (113, 813) to the free end of the tenon (13, 83), - the eyelet (12, 82) extends opposite to the first portion by the tenon (13, 83), - openings (131, 831) are provided in the lower portion of the fins (121, 821), at the junction between the portion for fastening the pouch (12, 82) and the tenon (13, 83), for setting the inside of the ring, thus the central channel, and the outside of the ring in contact with each other. - a first portion called cap (11, 81) provided with an upper tubular portion (111, 811), preferably cylindrical, whose lower end is partially closed by a bottom (112, 812), and provided with an outwardly projecting flange (113, 813) dimensioned to bear against the upper opening of the bottle and to be clamped between the upper opening of the bottle and the outer edge of the extraction means or the outer edge of the cup equipped with the extraction means during packaging of the container, - a tenon (13, 83) for fastening anti-collapse means (6, 6', 9) or an immersion tube, wherein the transverse cross-section of said tenon (13, 83) is smaller than the transverse cross-section of first portion (11, 81), - which first portion (11, 81) is extended from the bottom (112, 812) by an eyelet (12, 82) provided between the upper tubular portion (111, 811) and the tenon (13, 83), wherein the transverse cross-section of said eyelet (12, 82) is smaller than the transverse cross-section of first portion (11, 81), which eyelet is provided on its outer surface with a portion (12, 82) for fastening the pouch and bears fins (121, 821) disposed opposite one another relative to the central axis of said portion (12, 82) for fastening the pouch, - the flange (113, 813) is located on the upper end of the upper tubular portion (111, 811), - the tenon is positioned in the extension of the upper tubular portion, on the side opposite to the flange (113, 813), - a central channel passes right through the ring from the flange (113, 813) to the free end of the tenon (13, 83), - the eyelet (12, 82) extends opposite to the first portion by the tenon (13, 83), - openings (131, 831) are provided in the lower portion of the fins (121, 821), at the junction between the portion for fastening the pouch (12, 82) and the tenon (13, 83), for setting the inside of the ring, thus the central channel, and the outside of the ring in contact with each other.