My boss is planning on buying me a Bolwell Arriba to use for work. It comes with a rack and a top box, but I also need to carry a laptops and similar sized things (books, files etc). Is there a type of pannier that would fit this model? I'd be after something rigid and lockable. I could probably get someone with the right equipment to modify the rack to suit. I'll probably have the rack extended forward above the pillion seat too, so I could strap on an LCD monitor in a box (as long as it doesn't compromise my safety).