First of all thanks to everyone who offered there knowledge. I have ordered the Hilleberg AKTO tent and THermarest Xtherm pad I am almost ready to pull the trigger on the Marmot 0 Trestles Elite bag at 3.12LB, and Sierra BackCounty bivy at 14oz. I already have one of those emergency foil looking bags. Im not sure how the foil bag could come into play but i figured it wont hurt to have it. With this setup how cold do you think one could sleep comfortably?