As a joke, I call this my "man purse."  I use this thing every single day, and I'm not gentle with it.  I carry a varying amount of stuff, and have used it on one shoulder and on my back.  Had no problems getting it comfortable in either location.

There are enough pockets for me to carry what I need. It swallowed a notebook no problem with plenty of room, so it's a nice size for students who would end up carrying more.  The interior pockets in the "second" big pocket hold a variety of things nicely, and the little hole for headphone wires is convenient.

I like the pocket on the strap, too. I keep my cell phone there, and it's big enough to keep it snug without worrying about it popping out. Whenever this pack ends up giving up, I'll definitely be looking into buying another.