Ridgeway by Kelty has copied the best features from other major manufacturers which gives this 50.8 Liter pack just about every important feature yet conceived. In addition to the above features are a GPS pocket, emergency whistle, media pocket with a waterproof zipper, detachable top lid, compression straps, side mesh pockets, built-in hydration system, and much more. We just spent more than one hour looking at all of the neat features on this pack. Total weight is only 4 pounds, 9 ounces !