Timbuk2 bag makers have equipped their legendary messenger bag in their distinctive 3-stripe design with a few new features: 4 small zipper pockets on its front, of which one is a key pocket with a spring clip. The spacious interior offers enough room to hold 2 heavy ring binders (the bag is labeled size M by the manufacturer) as well as smaller compartments for your mobile, pens, money etc. The strap comes with a detachable shoulder pad and can be extended with a fastener. This way you can shoulder the bag first before fastening it to your back. A small belt will help you attach it in the right position so that it won't slip forward when cycling. 100% nylon.