The ortlieb messenger bag pro lives up to its name and is a favourite with professional bike messengers it has the heralded robust construction that you have come to expect from ortlieb so it can keep up with tough daily use plus has additional features aimed at the professional messenger too the back of the bag has a transparent and waterproof folder to hold a a3 sized posters offering advertising space on the movethe inside of the bag also bears the hallmarks of a bag that has been though