Credit Card Multi Tool
Billed as "The ultimate companion," the Tool Logic Ice Credit Card Survival Kit has a knife with 2" serrated blade, can and bottle opener, tweezers, toothpick, awl, screwdriver, compass, and a bright LED light -- all in a 1.3 oz, 1/8" thick credit-card sized package. I don't know how the TSA will feel about this but I sure dig it. $14.18 at CampingSurvival.com.