For backpacking, thru-hikes and alpine expeditions, the Ariel AG Series has a pedigree like no other pack. We have set the bar for technical backpacking packs by combining Anti-Gravity technology with customizable fit and innovative features like our 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 Ariel AG 55 pack. No matter where you go, the Ariel series is backed by Osprey's All Mighty Guarantee.