Nearly a pound lighter than the Exos 58 and featuring a more fine-tuned adjustment system, the 55-litre 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 endeavours on the Appalachian Trail, Tour Du Mont Blanc and beyond. A tensioned mesh backpanel keeps the weight off your back, enabling highly ventilated carrying comfort. Compression straps and removable lid allow for functional capacity adjustment. Lightweight fabrics deliver durable performance. Sheds 74 g / 2.6 oz. when the top lid is removed. An integrated FlapJacket secures the main compartment opening, providing weather protection and load stability when the lid isn't used. Removable, floating single compartment top lid with key clip