An attachable hanging hook for removably hanging a carrying bag from an upper edge of a vertical support surface or from an edge of a horizontal support surface includes a pair of hooks and a central joint. A first hook is pivotably movable about the joint and a second hook is rotatably movable about the joint. Depending upon the orientation of the hooks relative to one another, the carrying bag can be securely suspended from a horizontal support or a vertical support. The joint also allows the hooks to be collapsibly folded onto one another for storage.