I thought alcohol would perform better in colder temperature compared to cold canister. Which is the primary reason to successfully build one beside boredom. Vargo's website claimed, " Alcohol is difficult to light in cold temperatures." One night, I left my canister in my pack, which was hanging on the bear cable, when it was 18 degrees. The end result the next morning was a lot longer time than usual to boil a cup of water to have a morning hot chocolate.I left my canister in my sleeping bag the next time and I kept kicking it around, I got annoyed by this.