Start a fire with nothing but a sandwich bag and water

Bag of water fire starter Veritasium

When you’re heading out into the woods, there are a few basic provisions you should never be without. Hydration is paramount, followed closely by nutrition, first-aid, and something to help you navigate.

And of course, you should bring some waterproof, strike-anywhere matches in case you need to build a fire.

But on the off chance that you’re stranded in the bush and your last match lets you down, the video above shows another way to light a fire that’s surprisingly effective. All you need is the Ziplock bag that held your long-gone trail mix—yet another reason not to leave your garbage behind when you’re out in nature.