Anyway, pretty much the leader in women's sleeping bags is Sierra Designs. Their Synthesis ($299) is a zero-degree women's bag that uses good 600-fill insulation. For more dough, the Katie Crux ($475) uses 775-fill down and has a zip-off top, so you can adjust it for different temperature conditions. And, although it's a men's bag, you might look at the Marmot Aguille ($499), a high-quality bag that's rated to minus five yet has a very slim cut.
You also could call Feathered Friends, tell them you want the Petrel (the ten-degree women's bag they makeit's $370) but want it over-filled for more warmth. They can do it for you, I know.
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