Jerry & William, thank you for the respective links. I must admit that as soon as any discussion turns to 'special' considerations, my alarm bell goes off. Probably because as you get older, you really begin to emphasize KISS.
There's a reason wood has been the go-to material for building structures for, oh 10,000(?) years. Same too with certain, simple to use metals for other uses. And then we get to nylon, which over the last 80 years, in all its various forms/permutations, really is a miracle fabric.
After my last trip, once again I learned (the hard way) that while one can focus on equipment grams & ounces, they pale in comparison to food & water, which given just a small miscalculation, amount to ounces & pounds.
Here's what happened: even though I'm very careful about measuring my food requirements, I still walked out with 4oz extra oatmeal, 4 oz extra cous cous & 8 oz extra GORP. 1 lb right there. Add an extra pint of water by misjudging (from the map) water availability/my hydration rate, and I'm now carrying an extra 2 lbs!
I mean, this discussion is over the difference of what, 4-5 ounces max? And for that I give up a basically fool-proof fabric (silnylon) that is widely accessible, relatively inexpensive, easy to repair, durable, and something I already know how to cut, sew & use?
I guess I'm beginning to sound like some curmudgeon, but seriously, the more you hike, the more you realize where the big weight savings really arise. After you make the basic switch to (rip/sil) UL equipment, improvements are minimal compared to what you eat/drink.