The ortlieb messenger bag pro benefits from a professional display surface for your own advertising the transparent and waterproof folder at the back offers space for a3 posters insider knowledge was the basis for the bags internal design the inner zipped pocket for receipts maps pens etc can be removed by pish buttons and can also be attached to the waist belt the organiser has subdividers to keep all your paperwork in order and you get fast access to bulky deliveries by using the roll