I just returned from an archery elk hunt in colorado. It was my first time out. It was a great trip with the exception of my sleeping bag. I purchased a WM Kodiak GWS 0 degree bag after reading that i could just unzip it and control the temperature. That didn't work for me. I was either cold or way to hot. I am amazed at how fast that bag builds heat. However, the tent i was using was a Hilleberg Nallo 2 GT. With it being a double walled tent, it retains a lot of heat. I think i am going to sell the tent as it weighs almost 8 pounds and go with one of these ultra lite setups that weighs in the 2-4 pound range. I was also planning on selling the bag and picking up an ultralite tent from WM. Something along the lines of a 15-20 degree bag. Next year, i want to keep camp on my back for more of the time. I should mention that the lows were in the 30's while we were there. I would assume that is normal. Wondering if moving to a single wall tent will let me get by with the heavier bag? I know if was significantly colder outside than inside that tent but i cant say how much.