Bicycle-messanger

Sometimes i worked as bicycle-messanger in Dresden /East Germany. Once i red a post-card of a messanger in Helsingfors (Helsinki /Finland), who cycled there in the winter and one day I listened a radio-transmission of bicycle-messangers in Kabul /Afghanistan. In which cities do you cycle as messanger and how is messanger-cycling there? If i would want to round the world by bicycle, in which cities could i earn the food of this world-rounding-trip as bicycle-messanger?