I had never owned an Arc'teryx backpack before purchasing this one, and I have to say that now I understand what I've been missing! This pack has plenty of room for day hikes, or overnight trips. I can comfortably fit my sleeping bag, tent, clothes, and food into this pack. The fit is incredibly comfortable - way better than my Osprey - and the aeroform back panel kept things cool for me on a hike through the Smokey Mountains at 5,000 feet elevation in 93 degree heat.
This is the last pack you'll ever buy!