while all the above are correct i would not use cast iron
for survival cooking.you want to use every BTU you can squeeze
out of a propane tank. just the fuel you would burn to heat
up a Dutch oven to the point where it would start to cook
something could be used to cook several meals in stainless
steel..i have and use cast iron pots but they are just used
in car camping where i can carry a lot of weight and have
a big pile of firewood.. remember that cast iron was used
in the "good old days" because people cooked on big heavy
cast iron stoves..very slowly..that slaveing over a hot
stove to cook a meal is 1850's not 1950's..and---i'm really
on a roll here..they used cast iron because it was the best
avalable at the time..tin was for poor people--