I'm putting together gear to summit Rainier in spring/summer (late June?) and do
smaller stuff around the Pacific NW in the winter. I currently have a
Patagonia DAS parka and a 32F down bag.
My impression from the archives is that the North Face Fission or
possibly Cat's Meow is the preferred bag for these activities. The
archives also imply a DAS parka is overkill for day wear. So if I
sleep in the parka, what kind of sleeping bag can I get away with?
Lighter? Down? A half-bag? Quilt?

