If you're obsessed with shaving ounces during backpacking, trekking and adventure travel excursions, you'll appreciate the lightweight and supportive Osprey Exos 58 Backpack. It features a newly updated Exos peripheral frame that combines 6061-T6 aluminum alloy with LightWire cross struts for enhanced load support. Oprey stretched a 3D tensioned mesh backpanel across the Exo 58's lightweight frame, so hikers and backpackers enjoy improved pack-to-body contact and excellent backpanel ventilation. At the top of the Exos 58 is a removable floating pocket with an internal key clip and under-lid mesh pocket. If you need faster access to energy bars or gels, you can slip small hiking and backpacking essentials into the sewn-in harness pocket, zippered mesh hipbelt pockets or dual side mesh pockets. As a top-loading backpack, the lightweight profile of the Exos 58 is excellent for fast-paced extended day hikes and weekend backpacking excursions.