90-liter, top-load main compartment with gusseted drawstring closure and adjustable top lid * Drop-bottom sleeping bag compartment with divider * ERGO-FIT shoulder harness, with adjustable load-lifters, is constructed with VAPEL mesh AIRFLOW and high-density foam padding * Dual, contoured aluminum frame bars can be adjusted to fit the shape of your back * Molded foam back panel with AIRFLOW channels to keep your back cool and dry