Disclosed herein is an overlap-structured container bag having an inner bag inserted into an outer bag. In the overlap-structured container bag comprises: (A1) weaving fabric used for a container bag of a hollow structure while a plurality of vertical reinforcing portions are formed; (A2) cutting container bag fabric in unit length; (A3) forming at least one of the lateral reinforcing portion on the inner bag when either one of the upper or lower portion of the cut container bag is selected as the inner bag; (A4) placing the inner bag into the outer bag by turning the open end of the outer bag inside out when the other one where the lateral reinforcing portion is not formed is selected as the outer bag.