Quote by robin morley View Post
Not sure as to the use of the aluminium for clipping into rock. This would lead to the pack hanging upside down. Done an awful lott of mountaineering over the years and I and all my climbing mates always attach the sack to the rock via the webbing loop you can see between the shoulder straps at the top. Sadly though I can offer no explanation as to the aluminium's purpose.
It's explained in the link from in post # 9: Attachment to a waist belt.