A method for acquiring quality of experience QOE of a telecommunication service is provided. The flexible container has a plurality of sides including an opening-containing side and another side having stiffness lower than that of the opening-containing side. The digital image processing apparatus has a storage medium, such as a removable memory card of a predetermined standard, in which is stored an image of a subject that is photographed and converted into digital signals. The envelope layer and the intermediate layer are each formed primarily of the same or different resin materials.