Sounds like, in the Osprey line, the Aether or Argon would be what you need. (I just realized that I leaped to the conclusion that you are male. If you are female, their Xenon and Ariel series packs are the equivalent.)
Being many years removed from school myself, I can't imagine needing anything that big for books. I'd suggest you get something specifically designed for that, in the 25 - 40 liter range. (Frankly, with technology being what it is, and e-reader software so proliferous, I was a bit surprised you're still carrying books.).
Haha, I'm a guy, 6'1" and 240 lbs, till it hits 100lbs I don't really care much as it doesn't bother me, sometime going straight up a hill for 3 miles to get to the next camp 50+lbs gets to me.
Now, for books, a small town, nope. My SMALLEST book is 10"x10"x2ish"
Largest is 13"x11"x3.25" LxWxD.
Each is about 7-11lbs, plus binders and yadda yadda. I'm. An honors student (basically harder courses that if you carry on with a higher/better diploma, also allows for up too 5.0 GPA rather than 4.0) so that doesn't help.
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