5,400 cubic inches or 80 liters; weight 4.3 lbs empty * Top-loading main compartment, front-loading sleeping bag compartment, and pair of mesh pockets for water bottle * Adjustable torso, shoulder straps and waist straps * Padded shoulder straps, padded waist belts and padded lumbar area for maximum comfort, with airflow system to reduce heat * Plenty of straps and loops for hooking climbing gear