I coincidentally just saw your old post saying you used Pertex Microlight to make a bag.
It's 50% heavier than Quantum. Not too concerned with the weight if it comes with a real benefit, but not seeing any listed in my reading.
[Quantum is 50% heavier still than M50 or Nobul1, both 10D, suspect that won't meet my durability needs].
What is best practice here? Durable outside or inside? more breathable in or out? Can 10D hold up a few seasons as an inner layer?
I'm thinking Quantum outer, M90-tafeta inner for better feel (though it will rarely touch skin). My current bag is quantum in/out and I like the feel, and have never had condensation.
Probably going to use 2 layers of 5oz/sqyd Climashield apex. Approx. 2lb fill weight, for 15-20* temps, hoping for zero with both bags.