The makers of this pack paid a lot of attention to the small details like fasteners, pockets, seams and fabrics, which is appreciated. The ventilation through the meshed shoulder straps and belt combined with the open mesh back make this pack very cool. I also really appreciate not dealing with that clammy feeling from putting on a sweaty pack after taking a rest. But the very bend in the frame that allows that airy gap behind your shoulders also limits the interior space of the pack, and fitting large items becomes difficult. Also, there is limited adjustability in the shoulder straps, which are sewn in, so if you are in between sizes, as I am, you're kind of screwed, since the pack will either be too long or too short (in my case, just a little short). Nonetheless, it's still a comfortable, durable pack, just not quite a perfect one.