I received this bag a year ago as a Christmas gift. I attend MSU Billings and just love the bag. Not only do my textbooks fit in, so does a water bottle, supplies for the day, and easy access to the front for my keys. After a year, the bag looks great, and is comfortable to carry up several flights of stairs.

Just got this bag and have given it a trial. At first I wasn't quite sure how to wear it. It has one shoulder strap not two. While the photo shows only one strap, it doesn't specify this in the description. You can just sling it over your right shoulder for casually carrying stuff around as an "urban" bag (doesn't work well on the left shoulder this way) or for a more secure carry you can put your head through the shoulder strap and wear it on the left shoulder with the shoulder strap diagaonally across your chest. Either way there is a small strap that goes across your chest for added support and a closer, more secure fit. Carried the latter way, this bag is extremely secure, ideal for mountain biking, motorcycling or strenuous hiking/climbing. I could also see this bag being an ideal personal items bag as a substitute for my Gator bag on plane trips if there was going to be a lot of walking or hiking involved at my destination.
While this is a great bag - I think it could still be improved:
Water bottle pocket - For me, this is always a desirable feature and there is enough room for one on this bag on the longer side near the bottom.
Small grab handle at the top
Straps on the bottom like the C-ruck to tie on a jacket
Small snap pocket for cell phone, etc.
For me, this would make it the perfect small bag for urban hiking as well as more active sports. Still love it though.

Last summer I found myself looking for a little bag to use on my motorcycle and the Rock Hopper was the perfect choice. I use it as a lunch bag, grocery bag, laptop carrier, and the perfect size bag for those weekend motorcycle trips out of town. The durability, looks, and functionality are everything a person could ask for. My hat is off to these gentleman and my appreciation for a very satisfying shopping experience. Thank You Gentleman.
(I spotted Chester on I-90 with his Saffron Rock Hopper as he went past me at a high rate of speed...jim)