The Aircontact Lite series combines a lighter weight design with a good harness system that can take a heavy load. This 40 litre version has a stretch front pocket, separate bottom compartment, and numerous pockets.  It is compatible with hydration systems and has a removable zipped lid.  Accessory options: has attachment loops for poles, ice axe, and helmet holder (sold separately).  

Weight: 1590 g
Volume: 40 10 L
Size: 73 x 30 x 25 cm

Deuter Aircontact System:  The easiest way to carry heavy loads, this harness system has an X-shaped aluminum frame that brings the weight close to the body.  The harness is adjustable to different torso lengths.  Back cushions have a pump effect that keeps air circulating.