This bag is like new and was only used once or twice (and not while on a bike, so no sweat, dirt or smells). This bag comes from Priority Bicycles. Here is how they describe it: The style of an everyday backpack that riders can wear to the office, to the classroom, or for a weekend day trip. The backpack quickly converts to a utilitarian bike pannier in seconds with the 2Wheel Gear pannier clasp system. The shoulder straps unclip into a hidden pocket, revealing sturdy, quick-attach rear rack clips that go from your back to the rear rack of your bicycle in no time. This means no sweaty back when riding and the ability to carry what you need for the day, in a bag that looks just as great on the bike as it does off of it. 20lb recommended weight limit. Expands to about 20L! Works with most rear racks