FEATURES. High strength single bladder with 3D air cell design that expands outwards for no more squeeze. Rear non-ditchable weight pockets,holds up to 5lbs on each side. Flexible cummerbund expands and contracts for depth compensation,easily adjustable. Adjustable cylinder locator straps for correct height. Low profile,molded backpack cradles the cylinder and as a cam locking cylinder band. Top loading zippered weight pockets and mesh weight bag. Easily removable mesh weight pockets inside each front pocket,holds up to 12lbs on both sides.