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I can make a fire completely with local materials, no modern gear or equipment needed. It will cook meat and other foods, boil water, and will provide charcoal for purifying water, as well as warmth for the cold.
If you can start a fire just by rubbing sticks, it's extremely useful for survival. Or just carrying flint/lighter to spark a flame, saves space and money. Just requires a bit of work, and I personally enjoy the whole ritual of building a fire.