The Tent Stove 
My little titanium tent stove is only 4 pounds, folds down to fit in my backpack and keeps me toasty warm on chilly nights. I'm even able to use it to charge all of my USB devices.
https://winnerwell.us/products/winnerwell-fastfold-titanium-tent-stove?_pos=2&_sid=b857685b9&_ss=r
Tent Stove
durvival