The Argon 70 is designed with extended trips and hard use in mind with, and it has the added benefit of a mouldable hip belt which further adds to the excellent carry system.
It has anatomical shaping, and an Airscape back with a central air chimney. Amongst many other features this sack has a removable and convertible top lid/bum bag, an Aquasource that converts to a hydration pack with straps, plus large stretch mesh side and front pockets.