High Sierra Col 35 Frame Pack 35-liter, top-load main compartment with gusseted drawstring closure and adjustable top lid. Padded backpack straps, with adjustable load-lifters, is constructed with Vapel&#8482; mesh Airflow&#8482;. Single, contoured aluminum frame bar can be adjusted to fit the shape of your back. Adjustable waist belt, with Vapel&#8482; mesh Airflow&#8482; padding, wicks moisture. Molded foam back panel with Airflow&#8482; channels to keep your back cool and dry.