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Ka-Bar Last Ditch Knife
About as long as a credit card, this low-profile knife can be discreetly carried just about anywhere. Made of black powder-coated 9CR18 stainless steel, the Ka-Bar Last Ditch Knife ($15) comes with a hard-plastic friction sheath and 30-inches of black 550 cord. Slip it in your bag, keep it in your wallet, hang it from your neck, or lace it into your boots.