Half-carabiner...half-firestarter. But stronger than both. Ahhh, the Firebiner hybrid is a multi-tool straight out of Underworld.
Firebiner design sticks to the traditional oblong shape and spring-loaded closure of a carabiner. The firestarter addition is subtle from a visual standpoint, the little flickable wheel situated at the tool's bottom left corner. But give a purposeful, Price-Is-Right-style spin along its (replaceable) flint and you'll be able to ignite anything from your campfire after a day of hiking to your nephew's birthday candles after some kid douses all the matches in the pitcher of lemonade he took out trying to whack the pinata.
Firebiners weigh in at one single ounce for convenient packing and EDC. They also have an integrated strap / cordage cutter on the side opposite the firestarter in case you need to cut a paracord, bank line, harness, or seatbelt, plus a flathead screwdriver and bottle opener an inch or so up from that. Two replacement flints are included with Firebiner purchases.