Snowhale 16L cycling hiking camping traveling backpack pro daypack High Abrasion Resistance,Highly Tear Resistant,Water-resistant Nylon Material Weight:17.6oz Dimensions:17.8x9.5x5.9 inches Resin sponge soft back creates a channel of air between your back and the pack so excess heat can move away from your back 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 Convenient for hiking,traveling,camping,running,cycling,mountaineering and trekking.