Climber Nick wrote a review of Arc'teryx Khamsin 40 Backpack - 2441-2746cu in on March 10, 2009
I purchased this pack looking for a pack to carry all necessary gear for 1-2 night solo winter trips. 40L wasn't quite enough for me. I have a 21" torso and 38" waist and a tall pack fit very comfortably. The laminated shoulder straps are wide and spread out the load nicely. Pack is a fairly narrow cut so stuffing larger items (sleeping bag) down to the bottom is a little tough. In the end I returned it for a 55L pack.