Description 1680 denier ballistic polyester and 1800 denier three-lined twill Jacquard construction Locking zipper pulls do not flap in wind, or open when in the locked position Waterproof pocket for water bladder Phoslite reflective piping One built-in sip tube/headphone exit port Hide-away adjustable waist straps Internal pocket for lap top storage accomodates up to 14”W x 9.5”L x 1.5”D Two-tone red and black lining interior Two multifunctional side pockets can be used for storage or as a water bottle holder EVA-backed PP board structural panels Internal organizer and media pocket Mesh padded back pad provides ventilation Built-in padded helmet house