Alpha 2 Medium Trip Expandable 4 Wheeled Packing Case Black. Tumi elevates your travel experience with Alpha 2—the pinnacle of design innovation, engineering, functionality and performance. Alpha 2 embodies Tumi’s commitment to making the best better; it incorporates over 30 design improvements and more than 14 patented and trademarked Tumi components. The result is a collection of cases that are lighter and stronger while offering increased packing capacity.