Quiksilver Optimus Backpack/Messenger Bag 100% Polyester/600D Polyester with Q-Tec Backing Dedicated laptop compartment. Clip on the removable shoulder strap to carry as a messenger or deploy the stowable overarm straps and carry as a backpack. Combining versatile functionality with ample organization. Stowable backpack straps. External organization with stash documents sleeve