A highly comfortable & flexible pack the Osprey Argon 70 rucksack is an excellent choice for backcountry adventures. This pack will get plenty of your gear in. The Aqua Source Re Curve clips into the pack to carry hydration vertically down the backpanel or across the top of your load, or use the sleeping pad straps to convert the Aqua Source Re Curve into a hydration pack. The top pocket converts to a lumbar pack with built-in hip strap & Air Scape lumbar pad.