a carrying device uses a folding structural frame covered by a shell . the frame is configured with two rigid members , which are joined together by two pivotable joints . a two - part base piece attaches to the frame and creates a structural bottom for the bag , with the base supporting articles placed inside of the bag . the frame and base create support that enables the bag to stand upright on a flat surface . the shell is made from a soft , flexible fabric material . the assembly is capable of folding to a substantially flat position , with the frame members moving relative to one another around the pivotable joints , and the base folding in half and becoming substantially co - planar with the frame . a strap attaches to the device in multiple configurations , allowing the device to be carried in different ways .