. Guaranteed 100%-waterproof main compartment is large enough for full-sized folders, books, and other large items that need to stay dry in wet conditions . Office organizer includes a place for pens, maps, a notepad, calculator, etc. . Fully lined interior . Adjustable shoulder strap with shoulder pad makes the mail bag as comfortable as it is useful . Adjustable hip strap keeps the bag tight against your body while riding, making it more comfortable than traditional soft briefcases