Andrew Chrysler wrote a review of Osprey Packs Atmos 65 Backpack - 3800-4200cu in on March 20, 2012
I recently used this pack on a 5 day / 4 night trip and I have positive things to say about this pack. I am nearly 5'10" with a 32" waist and Medium was a perfect fit. The 65L pack is a good size, holds a lot of gear but can still compress down pretty small.
Good pocket system. Sleeping bag has its own home and pockets on the outside keep things easily at reach. Side pockets are good for water bottles, tent poles, whatever.
Wasn't too hot on my trip, but ventilation was real good.
Nice and light, but big enough to carry all your stuff. Dig it.
Stretchy side pockets aren't too durable, but then again sandstone is rough on all fabrics.
Top pocket detaches, but I can't figure out how that helps me... As far as I can tell you need some cord to rig up a backpack
After a first trip with this bag, I appreciated the build quality and layout of this pack. Osprey makes a good pack and there is a reason this pack has so many positive reviews.