This pack is AMAZING! I've only had it for a month, but it has proved its self already with ice climbing excursions! Very comfortable, carries exceptionally well when loaded, and I love how the crampons and ice tools attach! I am 5'3 and 110lbs. I went for size medium even though small was my recommended measurement. I did that to accommodate for winter layers and more jackets under the pack, as well to get the increase in volume (52L). It was a great choice! People have complained about not having an exterior pocket for a nalgene. I carry my liquids on the inside so there is the smallest chance possible of hang ups of gear in trees, etc, but if you wanted a nalgene would easily fit in the crampon pocket. I would give this pack 6 stars if I could! Best pack I own, and if it ever needs replaced I would definitely repurchase!