Originally Posted by Flying_Spaghetti_Monster
What about Lafuma or Marmot, and what is better down or synthetic?
I sold Marmot and other high end bags for 13 years, I don't have any experence w/ Lafuma. As far as down vs. synthetic, they both are good and both have pros and cons. If you get the syn bag wet, you will still be wet but it will keep you warmer thru the night and will most likley dry out in a few hours depending on the humidity. The only real prob w/ g/d is "if" it gets wet it will take days to dry and then will dry with clumps. You can launder the syn bag in a top loading washing machine and line dry it. I have done it 100's of times w/ rental TNF bags. You can wash g/d, but drying it is where it really gets tricky. It least to do a pro/factory job! I have a company called Mtn. mend do mine. I think they are still based in CO.? G/d keeps its temp rating longer than syn and can be "revived" over the years. Syn bags can not be revived, they just won't be as warm over the years gone by thus loosing loft/trapped dead air space. Of course there is low quality g/d/feather bags that suck, but when you are shopping Marmot, TNF, Mtn. Hardware, Big A ect. you have nothing to worry about. They are all quality. G/d bags are lighter in weight and just about half the size when stuffed into the stuff sack! G/d is more money though. I have 5 bags, 2 syn, 3 g/d, but if I could only have 1 it would be g/d. When I do winter Grand Canyon trips, I take my g/d bag. I stuff it into a H2O proof stuff sack that is the same size as the factory stuff bag that comes w/ it, then put it in my big dry bag w/ all my other stuff (double bagged as I would do w/ a syn. bag). If you have the extra $$$ and want to save space and weight go with a bag w/ at least a 600 and up "fill power" which means, what ever the fill power number is, say 600, means 1 oz. of goose down will fill 600 cubic inchs of space. It is a refrence for warmth per weight measurement. So 800 fill power would be warmer for the same weight as say 600 or any number that is less than 800 but will weigh the same, but it will cost more sense there is more down pod and less feathers. One last thing, if you are an average size person or bigger, I would highly recomend a semi-rectangular bag! They are getting harder to find in goose down last time I checked for some reason but they make them in syn also. It just gives you more room to move around than a "mummy" but not as large as a full rectangular bag. It gives you best of both worlds. I use mine in sub freezing temps and sleep great. Mosly unzipped.
Hopefully this will give you some insight and help you on your bag selection?
Good luck and stay warm!