I'm trying to shave some weight and volume from my sleeping setup, because it is by far my heaviest luggage category. i use a bivy, air pad, sleeping pad, and air pillow. I'm wondering if there exists a blanket that's warm and light that I can use in place of my sleeping bag. my reason for doing so is because the air pad provides me adequate insulation from the earth. so i don't see much of a need to be protected from underneath. if I could cut my sleeping bag in half and just use the top part to stay warm from the air, that would be just fine. anyone know of a blanket I could use for this?
btw. I'm trying to have something rated for the low 40s at the coldest. I was able to be comfortable in the mid 30s with my existing setup. I'd like to think I'm not sacrificing anything by going with blanket vs sleeping bag.