Instead of using expensive non renewable propane burners create one of these
take a tuna tin can or any can that you can find that is convenient..
preferably with a replaceable metal lid
Roll up some corrugated cardboard, and place inside,
fill half up with molten wax or molten fat … and let it set …
You now have a burner that is inert and wont explode in your bag .. can be refilled from rubbish you can scavenge and be stored indefinitely (even when using fat, rancid fat might not smell nice but it still burns. )