When you're shopping downtown, a credit card can be a very useful tool indeed. But when you're stranded in the wilderness a credit card is pretty much useless, unless of course it's the Tool Logic Survival Card.
It's not linked to any of your bank accounts, but it does allow you to light fires with a magnesium fire starter. You also get a serrated knife, a signal whistle, tweezers, a toothpick and an LED flashlight. Great for surviving in the woods, not so great for buying jeans.