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Jansport Big Student Backpack (Black) [link]
The Jansport Big Student has always been my go to. Fits a lot of stuff and has a ton of little compartments. Depending on the color, its $30-50 and they last forever.
I was going to recommend Jansport's Big Student Backpack which I use every day at the gym but this Datsusara looks even nicer.
Here is a great one.
If you're talking about backpacking, every model is available in black from every brand I know. Give them a ring. :)
While it's not exactly stylish, I use this Jansport backpack at school, and love it. It's got a lifetime warranty, holds a ton of stuff, and is quite comfortable. It doesn't look as square as that picture either, unless you filled the thing with blankets or something, just FYI.
I would look into Jansport packs...possibly the best quality for the price at this level. Here are some that would get the job done:
JanSport Big Student Classics Series Daypack - cheapest
JanSport Right Pack Backpack - classic
JanSport Baughman Backpack - probably my pick of these