Ka-Bar Tactical Defense Institute LDK ($15 @ Amazon.com)
Best used for: Fighting off thugs, opening letters
The LDK stands for Last Ditch Knife, which means it’ll have your back whether you need to plunge the .8-ounce, surgically sharp piece into someone’s gut to save your life, or you want to carve obscenities into a desk. The LDK is the size of a credit card and was meant to be concealed somewhere about your person — it’s even small enough to fit in a wallet. Its black powder-coated 9CR18 stainless steel construction makes it one of the most durable yet low-profile cutting tools around.
