Looks like a great REGULAR pack for carrying books and laptop when you're on foot.
But to me it looks too boxy for a biking pack- i think it would swing from side to side too much. A waist strap might help keep it steady, but it doesn't have one.
If you're looking for a biking pack, I find this pack works wonderfully well for me on my bike:
http://www.golite.com/products/NS_pr...?number=PA5110
It's tall and narrow and very lightweight. Stays put on your back without swinging. The picture shows it fully loaded. It has a water hydration system (that I removed from mine) and you can actually stow your helmet in the front pocket. If you shop around online you can find it for less, maybe $70 or so. I also like the yellow color for traffic visibility.