Everyone sleeps at different temps obviously. My mate bought a halo, very nice lightweight bag, supposedly water resistant. They are designed to be slept in using layers should you encounter a colder night than normal, they're not an extreme low temp rated bag. G got cold in his bag a couple of nights on our roar trip...got to negative 7 or 8, snow on tent etc. He had to put on his down jacket and hat to get a good night sleep. One night his feet must have been touching the end of the tent and his bag sucked up a fair bit of moisture.
I bought a Macpac epic 600 last year before winter tahr trip last year and am very happy with it. I sleep in my undies with a silk liner and have yet to get cold, my nose will be icy cold but i'm toasty as in the bag. As Tussock says, my wet gear comes off and stays outside, tucked under the vestibule I am not climbing in and out of. Wet gear and boots creates moisture.
Another thing to really consider to keep warm is a decent filled sleeping mat, so you have decent insulation from the cold ground. They can make the world of difference.
We always laugh at how the old timers must shake their heads at us with all our flash gear we use to keep comfy and warm. Man some of those guys must have been tough bastards.
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