Nearly a pound lighter than the Exos 58 and featuring a more fine-tuned adjustment system, the 55-liter Exos Pro is the most comfortable ultralight thru-hike backpack in its weight class. A highly-ventilated AirSpeed backpanel supports light loads with ease while maintaining maximum airflow across your back, making it an ideal pack for your most long-distance endeavors on the Appalachian Trail, Pacific Crest Trail and beyond. Removable, floating single compartment top lid with key clip. Four webbing lash points on top lid. FlapJacket secures main compartment access and provides weather protection when lid isn't used. Removing top lid reduces carry capacity by 9 L and weight by 80 g. Internal hydration sleeve with center back hose port and Osprey Hydraclip for easier reservoir hanging. Internal compression strap keeps loads stable. Large front fabric compression pocket with stretch side panels accommodates overloads. Multiple front panel lash points for securing extra gear.