In looking for a new zero-degree bag I came across this one last night.
http://sierradesigns.com/sleeping-bags/bed-style
It's the new Sierra Designs Backcountry. The zipperless design is intriguing to me. Personally, I have a hard time zipping all the way up in the confined space of my mummy bag. I also toss and turn a lot at night and many times wake up with the bag in some cockamamy configuration. So here's something I can just kinda wrap around into place. When it's cold I'll sleep with my fleece jacket on top of me and kinda of wrap it around my torso similar to this.
My question is about the fill. When I look at the site the 3-season 600 fill bag is rated for cooler temperatures then the 3-season 800 fill. I'm trying to understand why. If anyone can help clarify this for me I would greatly appreciate it. Ideally I'm looking for a zero-degree bag.
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