It always seems to me that the hard part of these comparisons is doing an actual apples to apples comparison, instead of apples to oranges.
The obvious first major dif in the comparisons is comfort, and the second is weather proofing.
So sure, if I am willing to sleep on roots, rocks or even best scenario just flat ground with a thin GG pad or Z-rest, then sure I can save a lb or two of hammock weight. But in recent years, I have come to realize that leads to suffering for me, and I won't even consider it. If I am on the ground, I will have a thick inflating pad, and that will add 2 or 3 pounds right back, the pounds I saved by not having a hammock.
Then there is the weather factor of comparing a small tarp with no bivy to either tent or even better a hammock which is off the ground. It seems like the risk of getting insulation wet is greater on the ground under a small tarp or dealing with condensation issues in a tent. I'm thinking of a time that a buddy got the foot of his down bag soaked inside a 4 season tent during all night light rain. We never were really sure if this was from condensation in the narrow foot end of the tent ( a NF Westwind) or if water blew in the foot end vent. Either way, he then faced a miserable following night when it dropped to 15*F, since his bag was a little marginal any way, before getting wet.
It seems to me their are varying amounts of bivy like aspects to using various hammock set ups, plus you are off the ground. So it is hard to do a direct comparison of weights with these variables, and I think you at least need to add the weight of a bivy to a ground/small tarp set up to compare correctly ( or better yet use a small tent). And even then, you better be extra careful about condensation. And you are still on the wet ground so be sure and pick a spot with good drainage and don't let a rock or thorn puncture your floor! Me, I routinely hang over a swamp!
Of course, with no trees ( above timberline for ex), it is back to the ground.
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