Brooklyn Industries Nylon Water Resistant 3 in 1 Frieze Convertible Messenger Bag This bag converts from messenger bag to backpack to briefcase General dimensions: 12.5 L x 17.5 W x 3.5 D Main compartment with zip closure & leather pulls: 12.5" L x 17.5" W Front zip compartment: 9" L x 15.5" W Back zipper compartment is lined in faux sherpa, and can fit up to a 12" Laptop