PopcornFool, good recap of my views on this as well. Although when we're talking about our beloved (
) teensy UL packs the difference between 10D and 20D, as you note, becomes significant. With a 65 liter pack it doesn't matter; 35 liter is a different story.
There is also such a thing as Argon 49 (7D) but I've not seen or read about it in actual use yet, although I haven't searched exhaustively for it.
But to me Argon is the perfect material for UQs, being quite splash and wind resistant.
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