Water resistant fire-hose makes a classic shape even more practical by keeping your laptop, books, documents, or even enough for an overnight stay, nice and dry.  Hidden magnets keep the full flap in place, covering a large outer pocket.  There is also an inner zipped pocket, and a smooth, dark green lining made from reclaimed military grade parachute silk.  Dimensions:  16 inches X 14 inches X 4.75 inches