I plan to do some overnight solo camping in the mountains (400-1200m elevation range) in the next few weeks to escape Vancouver for a bit.
My available layers I can bring are polypropylene thermal underwears, wool sweater, an ECWCS fleece jacket, goretex/PVC jacket some good socks and alike, and I've been able to sit around still overnight without miuch trouble in parks at home with food in my stomach and a bit of concentration (200m, ~4C at night here)
I presume it is below freezing up at the 1km+ range, last October I remember a bit of snow around there, but mainly in the open.
Do you think I can just get a bivvy with maybe a metalic inside, or a simple tunnel/tubular emergency tent, put a tarp over it and expect to survive a few nights in the colder mountains?
Are there any other recommended minimal sleeping arrangements I can use for this kind of climate/weather?