A briefcase includes a hinge end, an opening end, a first side and a second side. A first case is configured to fit snugly between the hinge end and the opening end of the briefcase, adjacent the first side of the briefcase. A second case is configured to fit snugly between the second side of the briefcase and the first case, adjacent the hinge end of the briefcase, leaving a contiguous open volume for use within the briefcase. A first tray having fixed compartments within for storing items is configured to fit within the first case. A second tray having removable walls forming compartments of variable size is configured to fit within the second case.