A fastening ring (1) for fastening a pouch (2) in a container (4) made up of a bottle (42, 43) provided with an upper opening closeable by extraction means (3) optionally mounted on a cup (5), an upper tubular portion, preferably cylindrical, provided at its upper end with an outwardly projecting flange dimensioned to bear against the upper opening of a bottle and to be clamped between the upper opening of the bottle and the outer edge of extraction means or the outer edge of a cup (5) equipped with the extraction means (3) during packaging of the container, a tenon positioned in the extension of the upper tubular portion, on the side opposed to the flange, for fastening anti-collapse means (6) or an immersion tube, and a portion for fastening the pouch (2), which portion can be formed by the tubular portion.