I find it hard to believe that submerged in water for 1/2 hour as Rod claims that water wouldn't be able to find it's way through the hole in a stuff sack and in to the 4 sq ft of breathable material. Any one care to test? Afraid the bag might be destroyed?
If on the other hand what Lynn says is true, that it will dry reasonable well although slightly slower than a traditional bag, then no problem.
A bad creek crossing means fording a snow melt fed waist deep creek. Lots of water, lots of force to easily penetrate a stuff sack, unless it's a heavy dry bag made for white water rafting. We could always throw in a water fall to make it fun. This means the pack would need to be dropped to avoid drowning and then found down stream/fall. Plenty of time under water to meet or exceed Rod's 1/2 hour "unreasonable" test.
To me this is unlikely (I'd rather not fall in a creek), but not out of the realm of possibility. Rod's snarky reply not withstanding, I like to think through worst case possibilities and come up with a plan to meet them before they occur. Rarely does this plan involve carrying redundant gear. Funny this type of planning is now mocked a few weeks after the "Be prepared, not equipped" article was generally well received here.
You all seem to be assuming that water will not be able to find it's way in through the 4 sq ft skunk stripe, but water vapor will easily be able to find its out. Seems a bit contradictory to me. Please explain.
As for washing: With a traditional bag, dust and body oil pass through the breathable material and deflate the down. Washing, I like to wash my bag after about a month on trail, is necessary to restore the down to full loft. I would think both dust and body oils would collect on the shell of the bag and then come in contact with the skunk stripe every time the quilt was stuffed into the pack. So yes at some point, certainly less frequently than a traditional bag, I think it will be necessary to wash the down not just the shell. Hand washing and line drying seems to be the only option. Is line drying fast enough to prevent it from molding? I assume so, but...
For an empirical, scientific based group you folks seem to be taking this a little bit on faith. Good luck with that.