A user is inquiring about the safety of transferring fuel from a larger canister to a smaller one for backpacking purposes. They are looking for guidelines or best practices to ensure safety during this process.
I have a big (500g) canister of Coleman butane/propane mix fuel (the tan/orange kind you can find at Walmart). I'm not sure what the blend is, possibly [70/30](https://www.anglingdirect.co.uk/coleman-250g-butane-propane-re-sealable-high-performance-cart). Is it safe to transfer the fuel (using a flipfuel) into a smaller, empty MSR isopro canister that's more conducive to backpacking and runs [80/20](https://www.rei.com/product/849634/msr-isopro-fuel-canister-39-oz-110-g)? Alternatively, is there any reason I couldn't use a converter to run a [single burner bottle top stove](https://www.coleman.com/grills-stoves/camping-stoves/single-burner/bottle-top-propane-stove/SAP_2000038235.html) (non-backpacking) that stove normally uses propane?