I worked with two guys who took standard old Kiwi tramping gear to the dry valleys in Antractica several years in a row. Mangy thin synthetic fairy down sleeping bags, bush shirts and Olympus tents. At first I thought this was madness, but there is more to it. One of them had a sleeping bag so thin it should not have been considered a sleeping bag.
Position your tent well. Eat a very high calorie dinner. If you have a stingy dinner after a day in the hills, you will freeze. Just pack butter in there like you are on an Antarctic crossing and you will be toasty. Keep your gear dry. You read a lot of hunting stories of guys with sodden gear and this need never happen, but it requires discipline. Your dry gear stays in your pack liner, you strip off wet gear outside the tent and leave it there, you put dry gear on inside the tent. In the morning you get up and put the wet gear back on. Wet stuff never comes inside the tent. The moisture will end up everywhere no matter what you do.
I bought a Kathmandu down bag 20 years ago and it has finally reached the point I can sleep in it zipped up. It has never been wet and has spent more than a year total in West Coast and Fiordland bush. If you went for 2 weeks a year that would take 20 years.
Have seen some shocking campsites from hunting parties in Fiordland. Maybe the worst are ones where water streams under the tent. Turns the tent into a form of refrigerator.
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