The Aircontact 65+10 Backpack by Deuter Packs is a great pack that offers a mid size range for anyone needing 4550 cubic inches of space, and a weight capacity of 65 pounds. 

Carrying heavy loads, means you need an excellent suspension system to help make it easier.  With the Aircontact suspension you get an anatomic X-frame stay system that offers you torsional rigidity and flexibility to move how you need to, without losing touch with your...