The great ql3 fitting system means that this bag is just as good on the shoulder as it is on the bike this fitting system keeps the main mounting components on the rack and back of the bag smooth so it is more comfortable to wear off the bikethe city biker bags have great style and the flap closure allows for easy access to a large main compartment with rooms for a4 files and up to 133 laptops with the attrition of reinforced sides and base the city biker is a tough bag more than up for t