High Sierra Cirque 30 Pack (Black) 30-liter, panel-load main compartment. Large zippered front pocket with inner mesh divider to keep contents separate. Protective storm flaps cover zippers. Molded foam back panel with Airflow&#8482 channels to keep your back cool and dry. Padded backpack straps with adjustable load-lifters and Vapel&#8482 mesh Airflow&#8482.