I have an older Western Mountaineering Puma MF (-25) sleeping bag. This bag is so rad, but I'm probably not going to go to the north pole. This is seriously one of the warmest bags out there. It is in very good shape, and as far as I know, it has only been slept in once (in my backyard to test it). Other than that has just been stored unpacked in various closets and shoved in the stuff sack a time or two. It is the 5'6" length but I am 5'10 and I fit in it pretty well. $550 obo.