Does anyone have any good/bad/other opinions or recommendations regarding ultralight sleeping bags? The western mountaineering ultralight 20 degree bag coming in at 1lb 13oz has been the best looking bag i've seen, in my opinion. Just curious if there are other similar bags out there that I'm unaware of that parallel the weight, quality, and rating. The last two years i have used a Mountain hardware Hyperlamina 20 degree bag, and it has been OK. Thanks for your time and insight.