PNWGator has it right. I just bought a down quilt from Enlightened Equipment, and it is great. Rated for 10 degrees and weighs 27 oz, and rolls up tight. I'm old, so I use a NeoAir mattress (1 lb), and the straps on the quilt go under it. If you're willing to rough it more, and you camp on top of pine duff, a 3/4 length 3/8" blue pad (5 oz) is enough. I have an 8 oz bivy bag, so I don't use a ground cloth. The bivy bag keeps everything together and adds warmth. I have a 13 oz. GoLite Lair (no longer made) that is a three sided silicone nylon tarp. I tie it to a tree, so rain and snow don't blow in the open end. The way to keep condensation down is to keep the sides lifted off the ground. I don't like that because it makes it colder, and lets snow and rain blow in. I don't worry about the condensation. If your tent is pitched right, it will be steep enough to let the condensation roll down without dripping. If not, the bivy bag keeps most of it off your sleeping bag. I use a Aquamira Water Basics filter system (10 oz) or a Sawyer filter. Gravity only, no pump. I can do an overnight bivy for less than 8 lbs. added to my pack, and be comfortable. If you want a really light stove, look at alcohol stoves. They take longer to heat water, but they work fine. My cook kit weighs less than 6 oz. When it is cold, I like my Pocket Rocket. Fast and convenient, and only a few ounces more. I do have a tipi tent with wood stove from Kifariu (not cheap), but it is heavy (11 lbs) but worth it for two guys in really cold weather.