To stay warm I add a temporary pocket under the hammock with a cheap space blanket and use xtra clothing in the pocket for insulation. Also wear long underware, socks and a sock hat. Beyond that you would probably need to go to the ground in a tent because the weight difference will surpass the weight savings of the hammock. Phat... help me out here. I know you have discussed this many times. Also a scale would come in handy. Something I have yet to purchase.