mike d long beach wrote a review of Osprey Packs Kestrel 48 Backpack - 2800-2900cu in on April 1, 2012
I Compared a lot of bags in person and this is just the sickest backpack I've ever seen. A 48 liter bag with a sleeping bag compartment that has removable divider, very hard to find. Has awesome compression ESP on lower portion helping to keep load up off my lower back. 3 pockets on tap Flap very useful. Straps to secure sleeping mat or gear to bottom also awesome and rare. This thing is versatile. Cinched up it can pass for a personal bag on airplanes and fully loaded your good for a week or overnight+ camping trip.
I'm 6-1 185 but my torso is a bit short so I got the S/M and have it on a more extended setting. You really need to try these on or order both sizes and return one. Stoked on osprey