Man this bag is durable! The Chrome Citizen bag itself is made of weatherproof Cordura outer shell with a truck liner. The strap is a seatbelt style material with matching quick release buckle that doubles as a bottle opener. It has a foam pad on the strap that is generous and feels comfortable. There are spots for carabiners and velcro for other accessories. Inside there are not any compartments besides in the front for smaller items, but you could opt for a laptop sleeve (at an extra cost). This bag is not ambidextrous, so you have to make sure you select the left or right hand strap. The Citizen is the medium size to the larger Metropolis and smaller Metro versions for you bike commute.