Judging from the number of backers and amount of pledges on Kickstarter, the B2 Nano Blade has to be one of the most popular tactical knives for everyday carry. Taking design cues from the B-2 Stealth Bomber military aircraft, it’s built extremely tough and versatile to handle most survival situation. The B-2 weighs less than an ounce, is made from heat-treated 440C black stainless steel, measures just over 3 inches when open, and has a flat and serrated cutting edge.