FlexVentTM injection-molded shoulder straps with a top layer of Atilon foam for added support and bottom layer of PE foam for added comfort * Comfortable, padded Airmesh back panel with Spine Channel and PE sheet for extra back support * Winged, stowable hipbelt * Large main compartment laptop sleeve (fits most 15"" laptops), organization and hydration port * Endorsed by the American Chiropractic Association (ACA)