For backpacking, thru-hikes and alpine expeditions, the Aether AG?? Series has a pedigree like no other pack. Osprey set the bar for technical backpacking packs by combining Anti-Gravity?? technology with customizable fit and innovative features like the new convertible top lid to create a more capable and comfortable pack for long-haul load carrying on any multi-day excursion. When you need a pack that can carry heavy loads for up to a week, there is no better option than the Aether AG?? 60.. . Body is made out of 210D Nylon Dobby. Accents are made out of 210D High Tenacity Nylon Shadow Box. Bottom is made out of 500D Nylon Packcloth. Custom Fit: The IsoForm5 harness and CM?? hipbelt provide outstanding fit and comfort for especially heavy loads and long miles. Both components are interchangeable to provide a truly custom fit.. Anti-Gravity?? Technology: The Aether/Ariel AG?? features a continuous, suspended panel of lightweight mesh extending from the upper torso through the lumbar area of the pack and wraps the user in supreme comfort.. Convertible Top-Lid Daypack: Haul your gear to basecamp, remove the top-lid and deploy the impressively functional DayLid?? to summit a nearby peak or backcountry picnic.. Removable top-lid converts to DayLid?? daypack. Dual upper side compression straps. Dual access side stretch mesh pockets. Zippered hipbelt pockets. Stow-on-the-Go?? trekking pole attachment. Additional main compartment access. Large stretch mesh front panel pocket. Dual front compression straps with StraightJacket?? compression. Dual ice tool loops with bungee tie-offs. Zippered sleeping bag compartment with removable divider. Removable sleeping pad straps. Integrated FlapJacket?? cover for lidless use. External hydration reservoir sleeve. Side panel zip access to main compartment. Anti-Gravity?? Suspension: LightWire?? tensioned, full peripheral frame comfortably transfers pack load. Anti-Gravity?? Backpanel: Top to bottom suspended mesh wraps shoulders, back and hips for a fully integrated backpanel fit. Isoform5 Anti-Gravity?? Mesh Harness: Interchangeable sizes for a precise, personalized fit; adjustable suspended harness with structural load lifter bar for load transfer and comfort; die-cut foam lower and mesh ExoForm?? wrap upper; adjustable sternum strap with safety whistle. Isoform5 CM?? Hipbelt: Custom heat molding and interchangeable sizes for a precise, personalized fit; mesh bridge between pads pulls in the lumbar to support heavy loads. Imported.