Fresnel Lens - Credit Card / Wallet Size

This little guy is small and light enough that there is really no good reason not to throw one in your wallet, pack, or anywhere else you can so that you have a fast and efficient way to start fires on a sunny day. Fresnel lenses act like magnifying glasses, which means that you can focus the sun's rays on a small point to instantly light many kinds of tinder. Char cloth works especially well in combination with a fresnel lens.