A drainable ostomy appliance including first and second walls connected to each other at or near their peripheries. The first wall has a stoma-receiving opening, and collecting cavity is defined between fee first and second walls. A connection member is connected to the first wall for attaching the appliance to a user or for attaching the appliance to a flange for attaching the appliance to a user. An outlet extends away from the stoma-receiving opening and terminates at an opening. A stiffening member is positioned at or near the opening which extends across the outlet. The stiffening member has first and second end portions positioned at respective sides of the outlet, and a thickness of a portion of the stiffening member at or near its first end portion is greater than a thickness of a portion of the stiffening member at or near its second end portion.
