Osprey Xenith 75 10" high 17" wide Custom-moldable, anatomically contoured BioForm4 CM hipbelt and shoulder s balance firmness and cushioning for optimal support and comfort Back panel is lined with reversed spacer mesh for a smooth and breathable contact surface Peripheral frame effectively transfers weight to the hipbelt; single 6061-T6 aluminum center stay helps maintain back panel shape Top-loading main compartment can also be accessed through curved side zippers on each side of the pack body; wide-mouth sleeping bag compartment is easy to load and unload Dual-compartment top pocket converts to lumbar pack with built-in belt