I need some advice...

I've lost my back pack and have decided to get a new one, but I need one that is big enough to carry a few changes of clothes, toiletries, a book or two, my computer (mac book pro), and some what-nots...

I've come down two these two choices... Help me out...

This is backpack one... I like this one better, just because it's cooler looking, but I not sure how practical it is... What do you think... Constructive criticism is always welcome.

Or backpack number two... Which seems like a more logical because it's bigger (or at least it looks bigger in the picture...) It's not necessarily ugly by any means... But number one is... is... white... I've always had a thing for white (that by no means has anything to do with anything racial)