There are great points on the shelters. I also think there is an excellent point about the extra socks. Quite honestly, I would add extra undergarments as well. Anything that has even the slightest bit of moisture in it will make the night extremely long. I do not mind the extra weight for the t-shirt, underwear and socks.

My $.02
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"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor