Marmot Graviton 34 Bag 70d 100% Nylon Robic Ripstop Material: [main] 70D nylon ripstop, [reinforcements] 100D nylon ripstop Volume: 35L (2135cu in) Support/Suspension: Ventilated Airflow Suspension, Tubular Aluminum Frame Shoulder Straps: airmesh Waist Belt: yes, padded