Where can i get a nice rucksack/backpack for school thats not overly sporty?

[ArizonaLeanne]

I'd like a proper backpack schoolbag (not a shoulder one) but all i can find are really bright childish ones, or sport logo ones (e.g big Nike ticks, which look a bit tacky).
I dont mind sport logos like Vans, DCs etc as long as its not too in-your-face.

Preferably UK (or European) sites/links please, thanks so much!