Explorer Credit Card Magnifier (Fresnel Lens)
This is the lowest profile way to carry a fire-making tool. As thin as a credit card, this magnifying lens will fit in your wallet and can be used to (in sunlight) to get a good ember going which can be turned into life-saving fire. This is another lightweight and inexpensive product that you should have in your kit.
Clear plastic construction. Measures 2 1/8" x 3 5/16". Green plastic slip pouch with Explorer logo.