35L Hiking Backpack Pro Mountaineering Backpack FKB879 Aglet ventilation function,protection and aesthetic design Switched air bearing system is able to fit back more effectively separated by distance,will be moving away the heat generated by the timely,ensure the back high ventilation and keep dry. High Abrasion Resistance,Highly Tear Resistant,Waterproof Material Weight:25.9 oz Dimensions:22.1x11.2x6.7 inches Convenient for hiking,traveling,camping,running,cycling,mountaineering