As a alpinist; those things look heavy!
Funny, I was looking at them and thought they are light! We'll see, I ordered two....
They are light.
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Alpinist light = sawn down toothbrushes, Trimming that little inch of extra string/strap which is not needed, discussing if you need a second pair of (lightweight microfiber) boxer for a week trip, using a big ziplock bag instead of a map case, etc.