A lot of research and testing goes into me buying a pack that's going to be hauled on my back for any length of time. I'm 5'7 135lbs and the medium size fits me perfect. This pack is nicely padded and can be cinched down to accomodate shorter hikes or you can strap your gear on for a weekend with lots of room. I find it feels very light on and wears like a dream with a full load and the design left me with plenty of ventilation, so no sweaty back. Build in rain cover was a welcome addition. I love that in addition to being top loading it has a nice zipped front panel access. I got Tule Blue it's so beautiful, a medium blue, the pics don't do it justice.