My original review ended up as a comment on the other post. I want to make sure it gets my 5 stars. There is good organization and use for all its pockets. Many different straps you can adjust for a comfortable fit. The NVIS does allow some airflow, however in the summer it can still get a little sweaty as expected.
I originaly got this for a day pack, but have since began using it as an ultralight overnight pack in the desert. In the main compartment I can store a neoair sleeping pad, jetboil, small quilt and a few pounds of food with room to spare. the small compartment fits my flashlight, first aid kit and personal items, compass etc. The middle open air compartment stretches out and is big enouph for even my small MSR 2 man tent (3lbs). I know its not the intended use, but it does hold up well. With 3L of water it comes out to 20 lbs. and dosent seem to be to much for it.
On day hikes its a little more room than i need in warm weather but sinches down comfortably. My wife uses the outside pocket to store water bottles, camera and the loops for hiking poles for me to carry and she can get to them anytime without stopping.