I have several Osprey packs, from small daypacks to a large trekking pack. All are top quality construction and extremely well designed. Osprey pioneered many of the more useful design elements seen on modern packs.
You might also check out Axio or Bobblebee packs. Both are hard-shell, and Axio even has a motorcycle-specific model.
2010 Triumph Tiger 1050se
2009 DL650A - sold
2005 DL650 - dearly departed
"I am enthusiastic over humanity's extraordinary and sometimes very timely ingenuities. If you are in a shipwreck and all the boats are gone, a piano top buoyant enough to keep you afloat that comes along makes a fortuitous life preserver. But this is not to say that the best way to design a life preserver is in the form of a piano top. I think we are clinging to a great many piano tops in accepting yesterday's fortuitous contrivings as constituting the only means for solving a given problem." - R. Buckminster Fuller