The collecting bag is intended for human body wastes and has a bag member (1) and a discharge portion (8) including a discharge opening (9). The bag member (1) and the discharge portion (8) are formed by a first and a second film blank (2, 3). A first plate member (21) is positioned on the first film blank (2) and a second plate member (22) is positioned on an extension (3e) of the second film blank (3) such that the plate members have a distance (d) between them. Two strap members (23, 24) are positioned between the first and the second plate member (21, 22).
