I Recently went on a three day alpine climb in Yosemite. I picked up this pack needing an approach pack that would be able to be stuffed into my regular pack. This pack is sick! It is big enough for a 70 m rope, a soft shell jacket, a hydration bag, climbing shoes and power bars and snacks for my climbing partners. I used this pack all day while pulling the west arete on Mt. Conness. The features most appreaciated are the ability to compress and adjust pack, the ability to expand when the load calls for it (rope in vs in use), and the belt pouches that kept a handy supply of power bars and shot blocks while in the climb. I would recommend this pack without reservation. The only caracteristic to be aware is being so light comes at a price of durability. After being beat on over several climbs with complete disreguard there were signs of wear and tear but the dyena grid did stop any tears from running. All in all it has become an essential piece of alpine climbing gear.