Oh and he wears his trousers down by his ankles too.
Similar principle to mittens - if you insulate your legs (or fingers) from each other they can't share warmthplease tell me that's about insulation in the sleeping bag...I've not heard that one!
Done -10 and 35mph winds on Scafell Pike with an army issue bivvy bag, elite 4 sleeping bag and aussie hootchie.
It was frozen everywhere for days so the ground was like rock, I had 1mm layer of ice on my hootchie when I got up in the morning.
please tell me that's about insulation in the sleeping bag...I've not heard that one!
The original question was what "can you get away with?"
Last November I participated in a survival exercise on Bodmin Moor - for me it was compulsory, not voluntary! We were only allowed two layers of clothing, a bivvy bag (no sleeping bag), no change of clothes (like spare socks etc), no food, water and some basic items like a hobo stove made of a survival tin, candle wax and cardboard. We were out for 5 days and found out afterwards that the directing staff had serious concerns about the weather - which was atrocious - horizontal rain and freezing nights, plus Bodmin Moor has to be the wettest place in the country - our feet never dried.
Anyway - it was survival - not living! We were on the move at night (avoiding the hunters who were after us) and we kept warm during the day by leaning against trees, tenting the bivis with our heads poking out the top, and lighting the hobos on the ground between our legs. We were in groups of four and were being monitored by the directing staff the whole time - nevertheless, with training you can get away with surprisingly little - although I wouldn't advocate it - it was bloody awful!
Get a detailed weather forecast for low lying areas and for high country - ignore it and expect the worst! Snow isn't normally a problem in this country - wet weather combined with cold is the real killer. At this time of year I leave the hammock and go to ground. If there's two or more of us I'll take a tent, but if I'm on my own I'll take a large tarp and rig it with three sides on the ground, pyramid stylee. A four season bag, bivvy bag and at least two sets of warm gear (one set kept in a dry bag) - put the warm kit on before you think you'll need it - for example as soon as you stop exerting yourself (hiking, setting up camp etc) get your warm layers on - even if you're still warm. Take more food and water than normal and chocolate as an emergency ration. A mobile phone with a spare battery - or something like a Powermonkey charger - and perhaps most important - tell someone where your going and when you expect to be back.
It's a fact that your pack is going to be heavier at this time of year but it's worth it to live (as opposed to survive) outside. At this time of year, I am always challenging myself to be as comfortable as possible - the sacrifice is carrying the extra weight!