The ortileb courier bag city 18l is a shoulder bag that can also be worn on the bike the waterproof courier bag made of pu coated nylon fabric comes with an adjustable shoulder strap that keeps the bag close to the body while cycling the padded back of the bag offers additional comfort ortileb courier bag city 18l features city shoulder bag in messenger style made of robust pu coated nylon fabric available in two different sizes lid with buckles and velcro fasteners for a