Josh Armour wrote a review of Osprey Packs Atmos 50 Backpack - 2800-3200cu in on May 9, 2011
I use the 50 for just about everything. The mesh panel supports heavy loads under a variety of conditions and layers. Great layout for fast packing/unpacking. And perfect balance of weight and sturdiness. Used this for everything from 600 mile sections of the A.T. to wandering Central America. No complaints, and as always, if I did, great product support from a great company.