I have the Oakley Flak Pack, and I love it! It's really made for the 15", but if you use Incase or any other protectors for your Macbook, then it will fit perfectly! Unfortunately, when I use my Incase, it just about doesn't fit.
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Whichever backpack you get make sure:
1. The computer is padded with at least an inch of foam padding on all 6 sides.
2. The straps are set so that not matter what you put in your bag, your back does not hurt lifting it up.
3. Test your bag with some books of a typical weight to see if it might get too heavy.
4. Make sure the books and power adapter are OUTSIDE the foam protection.
5. Make sure that the screen has no chance of jamming into the keyboard.
6. Shut down your Mac before transporting it. There have been reports of closed lids still resulting in a Mac waking from sleep, and overheating the Mac. Also the potential exist that a jarring action if it is awake unknowingly to cause a hard drive head crash. While normally it shouldn't happen since the sudden motion sensor can prevent such things, it isn't a perfect means of preventive medicine.
7. Don't let any loose filaments or pencil lead, or other small particles get inside the foam cover. Clear it carefully of all debris when removing the notebook.
8. Always lay the backpack so that the computer is on top of any books, and not underneath them, as the pressure might be enough to get through the foam, and hurt the computer.
9. Make sure the bag is never left unattended for even a second, unless you are in a secure place that only you have access to. Same with the notebook.
10. Don't make it obvious that it is a computer bag. Black bags are especially obvious.
