Ok so I have a bad back due to an old shoulder injury that never got properly treated and have been advised to use a backpack rather than a shoulderbag post-haste to alleviate some symptoms by my physiotherapist. I travel a lot with work and have to pack papers, laptop and all that kinda stuff, would be nice to have something with a separate laptop compartment and main section. Want something stylish but not too German IT consultant looking nor too studenty.

looked at this but it's a bit studenty and seems expensive for what it is.
http://www.eastpak.com/uk-en/backpacks-c120/back-to-work-sunday-grey-pEK936363+00+999.html

Any advice hivemind?