Details    Custom-moldable, anatomically contoured hipbelt features gender-specific angles and padding; it balances firmness and cushioning for optimal support and comfort    Osprey certified custom molding is available in most REI stores—check your local store for a custom hipbelt molding oven    Shoulder straps are designed with thoughtful angles and varying degrees of padding thickness to create an anatomic fit for a female neck, shoulders and chest    Back panel is lined with flat 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 a curved side zipper on the front of the pack body; wide-mouth sleeping bag compartment is easy to load and unload    Top lid converts to lumbar pack with a built-in belt    External hydration sleeve in the back panel simplifies refilling and helps protect pack contents from spills (hydration reservoir sold separately)    Large stretch-mesh front pocket makes it easy to quickly stash and access extra gear    Zippered hipbelt pockets and dual-access stretch-mesh side pockets provide secure storage and organization    The Osprey Ariel 75 pack features dual side compression straps, removable sleeping pad straps, trekking pole attachment and 2 ice-axe loops and handle wrapsImported.SpecsFrame type InternalBackpack style Lightweight backpackGear capacity (L) Medium =  75 liter Gear capacity (cu. in.)  Medium =  4,577 cubic inches Weight Medium = 4 lbs. 15 oz. Weight - metric Medium =  2.25 kilograms Fits torso  Medium =  18 - 20.5 inches Adjustable torso YesFits waist/hips Medium = 30 - 34 inches Number of stays 1 aluminum center stayPack access Top / frontNumber of exterior pockets 6 + main compartmentBest use BackpackingMaterial(s)  Ripstop nylon/nylon oxford