Lol you got me laughing some fucking hard.
You guys don't get winter, our camping season starts when nightime temps get above that of your coldest in winter.
The idea is actually pretty good, granted useless in france, but in northern places where one is usually trapped inside all winter this could be killer.
you are wrong the last few winters were exceptionally strong, let me put it like this, we have people freezing in the wicklow mountains, so its cold enough.
It certainly is cold enough that you need a fire, and I am speaking out of experience since I am a lot up there.
As I said, I use the Snugpack Special Forces (why they named it like that is baffling to me) its a very very good sleeping bag, I also use a Karimor bivvy bag in case it gets wet, I never had any problems nor was I cold while in the bag.