Vaude Siena40 - Your comments please

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Hi. I just bought this backpack a few days ago:

http://www.momovelo.com/images/aug/129.jpg
(i can't get the image to show, it just comes up as a link)

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=2904&item=3622355475

I will use it to carry college books to and from school. Is this good for books? I've read that it's great for clothing, but I don't know about actual textbooks.

I also have a rack on the rear tire which I intend to use to it's full capabilities. What should I use to tie books down?

Any comments welcome.