With this pattern you can sew up two types of of rugged rucksack in two sizes -- a basic modern version with webbed straps or a rustic replica version with leather straps. A roomy main compartment in the bag is big enough to hold a laptop. Two additional optional pockets inside divide the bag into three inner compartments -- perfect for keeping it organized. Two outer pockets with storm flaps can also be added to the outside for more storage. Adjustable shoulder straps makes this bag comfortable. The top rolls down and is secured with a strap. Outer Fabric: Waterproof Nylon Pack Cloth, Cordura, or any medium- to heavyweight fabric such as canvas or denim. Inner Fabric: Coated Nylon Taffeta or any tightly woven lightweight fabric.