Material:nylonSize: as shownNylon liningZipper closureWaterproof material: This messenger bag is made of thick and durable waterproof canvas, which can protect your laptop and other items from heavy rain and snow.Large main compartment: Zipper opening and closing can accommodate 3 inches of binders, separate laptop compartments up to 17" / 17.3" laptops.Practical and perfect structure, equipped with various pouches, including 2 inner pockets, 3 front pockets (a storage pocket under the flap, the front pocket is used to hold your ID card, pen and key), 2 side pockets and 1 back pocketCarrying and safety: the adjustable shoulder strap and top handle make you carry comfortably; the buckle and zipper closure ensure the safety of the bag; the reinforced stitching can be used for a longer time.Multifunctional design: This shoulder bag is specially designed for colleges, high schools and staff who need to carry laptops and other accessories with them. It can also be used as a travel shoulder bag or even as a padded SLR camera bag