I bought this as an all around pack. Something I could use for school as well as day hikes. It was not as big as I thought it would be based on previous reviews but it still is a great pack. I can fit my 15" MacBook Pro, a Nalgene, and about 3 books (not large hardcover books) in the main compartment. With those in the main compatrment there isn't any room in the front smaller pocket for anything substantial.
If I lost this pack or could buy any other pack I wanted again, I would buy this pack without thinking twice.