Tyler Chancewrote a review of Osprey Packs Atmos 65 Backpack - 3800-4200cu in on August 9, 2010
I really love this pack! It's my first Osprey and I'm definitely impressed with the build quality and thoughtful design. I live in Texas where temps easily reach 100+ F, so the vented back was a key component for me... and let me tell you it's a life saver. I'm 6 ft 165 lbs and the size Medium fits me just fine (see the sizing chart...as the size really depends on your torso length). I did a 4 day backpacking trip in the Lincoln National Forest with about 45-55 lbs load and was very pleased with the packs performance.