American Shield 35L Computer Bags Outdoor Sport Men/women Mountaineering Hiking Cycling Backpack Laptop Tablet Macbook Notebook Ipad Iphone Best Girls Boys UNISEX.TF009 Powerful plugin system Widening thick shoulder straps: thickened cotton, cellular breathable meshto further reduce shoulder burden. External dual pockets feature elasticized mesh, which expands to secure various size water bottles. Airflow Back System Multi-panel airflow design provides extra padding for comfort and maximum back support. Approx size: 12 * 8 * 18 inches (L * W * H )