The initial use case guiding the design principal for CNK’s 1st duffel bag was in the Gym. The contrasting shell and lining fabrics both in color and hand feel lend to the items the bag encounters internally and externally. Iterations of this design have also developed a variety with the lining material being more 1000D Cordura for a Tool Bag use case, testing zipper sizes and handle dimensions for most appropriate application, different user defined internal pocket layouts in the gym variants, laminating the inner and outer panels before final construction , and the addition of a MOLLE webbing chain across the opening and a zipper garage at each end.