I love my Western Mountaineering Ultralite bag, which has taken me comfortably down to 15*F (wearing all my insulating clothing inside), but it is now priced over $200 more than when I bought it 11 years ago! If I wanted a new one now, I'd have to start raising geese!
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey