2 BIC lighters - 1.4 oz will GUARANTEE a fire (.) period.

Sometimes if I am lazy and the weather is awful, I'll use an esbit to light a fire.

BUT

Although making a fire by alternate methods (spark, friction) is fun, to pretend that you need chemical accelerants to light a fire is like carrying lighter fluid or a propane torch. I have made it through nearly 50 years of extensive BPing and maybe half a dozen times I have used a "fire starter" or propane stove, to start a very wet fire. Chemical firestarter accelerants have no place in a modern backpack except as entertainment for the user. They certainly are not required.

Just my $.02
Jim