>>1327133get one of these chinkshit isobutane refill adapters also
it's a game changer since 4-8oz isopro canisters are pretty expensive, but you can refill them with normal $1 butane canisters from a chinese grocery store.
And since you can run the kovea inverted, you can use pure butane below freezing (though for serious cold weather trips you should just get a new regular isopro canister)
https://www.youtube.com/watch?v=hSfXU0RCYTQ 