Popular gas cannisters found in here are either Lindal Valve Screw which is used for EN 521 appliances or Cassette gas cannister that is commonly use on steamboat stove.
For most mountaineers here, they still prefer to use Lindal screw stove. The reasons are simplicity, these stoves burn better in high attitude, they are easier to setup and they can pack together with the cook sets.
However these Lindal screw stove cannister do not come cheap, A solution to this problem will be ideal to fill cassette gas cannister into Lindal screw cannister. Here is a product that is capable of doing this task.
Gas refill adapter
It's only about 5g,so u can carry it easily when u go hiking and camping.
With this adapter,u can refill your gas canister in a similar fashion that you would a gas cigarette lighter.
U will save quite a bit of money by refilling
How to use it
Weighing unused full butane canister and write with felt-tip on the base.
Place empty canister to be refilled in freezer for approx. half hour.
Take canister from freezer and place adaptor onto the canister.
Take your new full butane canister and insert into adaptor.
Push canister firmly down about 10-15 seconds at a time, checking each time the weight of the canister.