I did a search and didn't find mention of this here. I just ran across a slightly lighter carabiner than the camp nano 23. Edelrid makes a "Nineteen G" carabiner that weighs in at ~19.5g. Full rated for climbing.
http://www.amazon.com/Edelrid-Ninete...dp/B00C28AA30/
Yeah, there are lighter biners that aren't climbing rated. And of course there are other options such as soft shackles and dutch clips. I just find full carabiners easier to use.
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