The Alpine tours backpack offers back system made from pressed Swiss wool. Thanks to the wool, the back of the backpack can absorb almost 30 times more moisture than a comparable back made from foam. The back design consists of two aluminum struts that offer high stability and guarantee great comfort, even when the backpack is heavily loaded. This backpack is very robust thanks to the use of the extremely tear and abrasion resistant material Nylon 420D Manstar.