Hiking buddy's son has a WPB-fabric Mountain Hardware bivy/tent conglomeration that's probably not much of a weight savings, but does let him sleep in seemingly impossibly small, level spaces. That's probably the main advantage it has over a stripped-down 1-man tent; okay, it's pretty wind-immune too. He's in his 20s so the weight just means he's not so far ahead of us on the trail.

Cheers,
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--Rick