This is a contender.
http://nunatakusa.com/site07/main_pages/product_sleep_systems.htm
http://nunatakusa.com/site07/main_pages/product_sleep_systems.htm
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If you are carrying it on your back you can't beat WM Badger. If you are keeping it stuck under the seat or in a vehicle then I like Wiggys. These are the 2 brand that I'll pick everytime. Just pick one that is right for your situation and temp rating. No need to sleep in a mummy bag if you are in a bear camp with plenty of heat. Nobody said you could only have one sleeping bag.I've used a W.M.Badger for a few years now and I'm very happy with it(with micro. fiber) Its the one piece of equip. that I never consider replacing
Tim