Air Support Back Panel - body mapping supports maximum ventilation. Magnetic tube trap keeps tube secured. Removable waist strap adds stability. 3D Vent mesh harness is lightweight and breathable. Helmet carry stows and secures. Integrated carry pockets keep tools and repair kit organized. Ventilated harness. 2L Crux Reservoir with Quicklink system. Gear capacity: 6-liters 360 cubic inches. Torso fit range: 17" to 21" (43cm to 53cm). BPA BPS and BPF-free construction. "Got your Bak" lifetime warranty.