High Sierra Classic Series 59301 Explorer 55 Internal Frame Pack 55 liter top load main compartment with gusseted drawstring closure and adjustable top lid Drop Bottom sleeping bag compartment with divider Dual, contoured aluminum frame bars can be adjusted to fit the shape of your back Internal hydration reservoir sleeve and dual exit 36x15.25x11 inches (91.4x38.7x28cm) 5500 cubic inches 55 liters