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My propane/butane/isobutane canister with stove top attached is about 6" tall. When I put a cookware filled with liquid on top of it, the center of gravity seems very high and the whole system seems not very stable, especially when it's windy. Any suggestions?
If it seems unstable as in wobbly then you might get better results by clearing out the ground you place it on so you have a level surface to work with (or by building a level surface with rocks or what you can find)
Another option is to get legs that attach to the underside of the bottle to make the setup more stable. Here is an example from ebay, but check your local stores as well, as in Sweden buying at biltema is cheaper than ebay in this case.
Looking at the photo, if the ground is as soft as that, burying the canister by 2-3 cm could help a lot. If you're camping at a beach and bury it halfway in the sand, then that should even work in high winds.
Apart from that, if you're willing to buy a new stove, there are a number of them that come with built-in legs, such as this one
You can get a hose or pipe which allows you to connect the burner to the hose then the hose to the canister. This allows you to put the burner closer to the ground, in a small divot, behind a stump or otherwise shielded from the wind.
I tried answering this, but the answer was locked. So anyway... I posted a picture of a 3" burner that only weighed 96 grams as opposed to your 6" tall burner. Using said 3" burner would make the the whole unit shorter and less top heavy.