I have a Feathered Friends Kestral that’s rated to 30. If I was able to shift all the down from undeenrage, theoretically what would this do to the temperature rating?
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Shifting down on bag
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I would estimate 25 f to 20 f. My experience has been that shifting it is one thing and having it remain there throughout the night is another. I took FF bag on my thru of the PCT and did this very thing on several occasions to get warmer those last few hours of the night.
I found that if I layed on my back I could move most of the down to the top from inside the bag, get warmer, fall asleep, and wake up cold a little later as I moved around from side to side and have to repeat the process.
I’m on the fence if I want to save weight going to a 20 degree quilt or switch from a flycreek ul2 to a duplex. Can only get one as I’m switching from a 45l Patagonia ascenionist to arc blast 60l. Decisions…decisions.
Shifting down while sleeping is one of the two things I dislike about my 30F Marmot Hydrogen with horizontal baffles. For a side sleeping that tosses and turns, the down usually falls along the sides overnight, reducing loft on top. This is one of the two main reasons I ordered an EE 20F quilt. The other reason is to have a hood that rotates with the head (looking forward to seeing how this works).
As for the Arc Blast versus the Duplex, if your current pack and tent work fine for you (other than weight), then calculate the cost per ounces saved for each item, then buy whichever one has the lowest cost per ounce saved.
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