Here's what other sites are saying:
For multi-day, multi-peak expeditions, the 50-liter capacity Proprius pack features ample storage in a lightweight design. Features a quick-set-up ski-carry system and a side crampon and skin pocket.
- The North Face
With enough storage for multi-day expeditions, the Proprius 50 Backpack by The North Face has got your back on your next adventure. It's lightweight construction and FlashDry backpanel doesn't weigh you down as you make your way to the hut on the first day loaded with all you gear. And specifically designed for mountaineering and skimo races, the pack has a covered ice-axe carry and an easy-access external crampon and skin pocket so you can make for quick transitions.
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