The Dynapack DX Rack Bag with Rain cover is a larger version of the DynaPack and offers nearly as much space as a Trunk Bag without needing a rack. It features an expandable top to hold a helmet, shoes and other large objects, perfect for commuting. Moulded from rigid EVA foam and 600 denier polyester for a sleek, aerodynamic shape, for the ultimate space saving luggage. Constructed from a lightweight aluminium exo-frame, it gives you a strong support for your load. The Rack Bag features a divided main compartment, plus one zippered handle.