Camping gas canister could be quite expensive, and the canister clearly said re-filling is strictly prohibited, but then re-filling is very attractive except money saving and environment protection, it also prevent us from bring canisters with little gas remain. Of course, re-filling could be pretty dangerous, and so if you don't know what you're doing, or there is some little places that you might not fully understand, DON'T DO IT!
First of all, keep the canister to be filled in the fridge in order to reduce the pressure inside so that the pressure inside the filling canister is higher.
首先，要雪凍個露營氣，減低佢氣壓，令供氣罐的氣壓大於露營氣罐。
Gross weight before re-filling:
充氣前重量：
After re-filling:
充氣之後：
即係足足充咗 70g，氣罐上寫原本有 110g
And that means we filled 70g of pressurized gas, the canister has 110g originally!
我之前用咗兩次，因為夏天煮食儘量簡單，用氣唔多。
That canister has been used twice, but since it was summer, cooking was minimal and gas consumption was much less.
呢種罐一個人用應該夠晒，冬天就用一次，夏天可以用兩次吧
This kind of canister should be enough for solo camping of one night for winter, maybe twice during summer.
--
After a one person trip, two simple meals plus boiling around 1.5L of water for drinking:
That means I consumed 218 - 166 =52g of gas.
After re-filling, I got:
Even more than that of the last time, maybe I cooled the canister for longer.
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