I have a 15° Marmot sawtooth that is pretty good, use a liner to protect bag and add warmth plus insulated mattress under. Has been good to 30 or so but below that feet get chilly. I've been considering a 0° bag from blackovis called the chugach(?). Combo down and synthetic that show up on camofire frequently for about 150. I have canvas tent with wood stove now