Im headed on a 10 day Stone Sheep hunt for the opener this year. I'm constantly trying to make improvements and cut weight where I can, but I'm looking for input or suggestions on sleeping bags. I currently have a Marmot Helium Membrane 15F (Long) bag. Weighed with a waterproof stuff sac its 48.8oz. Any suggestions on a replacement bag? Temps for the time we will be gone should be hovering around 32 - 35F.