The Axius RackPack is made of heavy nylon packcloth, and is made to be used only when completely filled. When empty, the bag folds to the size of a loaf of bread. When filled, it can accomodate over 15 cubic feet of storage space. It requires a roofrack for attachment, and must be lashed with eight included straps on all four sides. This attachment uses integral buckles, or quick connect hooks.
Access is via a large double zipper which opens the rear half.
The Rackpack can be secured with buckles or hooks. Accessing the cargo from the back is easy with the large zipper. When considering the purchase of a storage bag like the Rackpack, many factors must be considered. The first of these is weather. I drove through some heavy rain, and suffered some slight leakage around the seams.