High Sierra 1800-Cubic Inches Opie Daypack Large front load main compartment. Multi-compartment design. Front zippered accessory pocket for quick-access items like ID and change. Core organizer with mesh pocket and pen pockets. MP3 player pocket with customized, zipper-stop headphone port. Side mesh pocket holds a beverage or extra gear. S-shaped padded shoulder straps with handy cell phone pocket. Comfortable padded back panel. Contoured daisy chain loops for attaching extra gear. Comfortable, heavy-duty webbing grab handle. 18.5"x12.5"x8.5" 1800 Cubic Inches