600D recycled polyester; Double-zippered main compartment; Separate zippered laptop pocket holds most 15 laptops; Comfortable, padded back panel with breathable mesh; Front zippered pocket with organizer; Hidden back pocket for valuables; Side water bottle pocket; Padded, mesh backed shoulder straps; Reflective detail on zipper pulls and straps; 12.6w x 17.3h x 5.9d