Introducing the Mini Mule! Half the size, just as awesome.
Adventure Wagon's Mule Bags are the best way to take advantage of vertical space inside your van. They combine the rugged durability of hard-sided cases with the collapsibility of soft-sided luggage.
The result is a unique overhead storage system that is strong and lightweight, and can fold flat when not in use.
Adventure Wagon's Mule Bag Installation Guide