The Osprey Men's Exos 58 Pack is an ultralight pack designed for thru-hiking. Move fast through the trails, gathering up the miles with a lightness on your back. An AirSpeed™ 3-D tensioned backpanel vents while transferring the weight to your lumbar region. Go fully featured with this top-loader or strip it down to cut the ounces. The floating top lid is removable, as are the sleeping pad and side compression straps.