Timbuk2 Classic Messenger Bag Classic messenger bag originally designed for hard-working bicycle messengers Ballistic nylon exterior and waterproof liner help the bag last a lifetime Large main compartment, front pocket with extra zippered pocket, and internal pockets Quick-adjust, side-cam shoulder strap; cross strap for stabilization (except XS) Comes in XS, S, M, L, and XL sizes in dozens of color patterns; lifetime warranty