I found the pack to be very comfortable, and I liked how it sat right in the middle of your back, not putting too much pressure on your shoulders, sternum, nor across your stomach. The hip belt comes off the side of the pack in a large swath of material as it rolls out over your sides, before becoming the usual quick connect buckle. This hip belt system really helped keep the pack stable, and conformable. The shoulder, sternum and hip straps can all be snugged down nice and tight, for those ultra rough riding moments. The hip belt is also stowable if one is so inclined.
The mesh back has a nice functional air channel system, which actually does seem to help alleviate some of the usual perspiration issues. The mesh backing is also very resilient and pliable, so the pack really conforms to your torso, which allows plenty of movements, and an all day comfort level. The pack is made from light weight nylon, which has been amazingly durable for the abuse that I have put it through. They use a combination of ripstop and trilobal nylons. The pack comes in all black or the white/orange, which I tested. I found that although the lighter color can pick up a few dirt spots easier, the lighter color reflected the sun in warmer weather, and kept your back a good deal cooler.
The main compartment has a nice long zipper which opens clamshell style. The large opening is nice and wide, so it’s easy to find things, and put them in, making it a breeze to browse for stuff. I found it was pretty easy to let it sit on its bottom while I grabbed things out of it. For my usual rides that I do, the 800cu in/13.1L storage space was more than adequate, and in addition the pack seemed to hold things in a very organized manner, perhaps due to the very rectangular shape of the inner chamber. I could really bring a lot of stuff for inclement weather, in addition to my knee/shin guards and the usual assortment of stuff.