On the hunt for cool birthday gift ideas? The deluxe carabiner multi-tool might be one of the most useful gadgets we’ve ever put our mitts on. In fact, if we ever became stuck on a deserted island following a dramatic plane crash, this is probably the one item we’d choose to have with us. Its locking clip lets you attach it to your belt, keys, bag, or backpack (or the pet seagull you’ve trained to catch your dinner). Its 3-inch knife is ideal for cutting up yams and coconuts, while its 3-inch serrated knife is perfect for sourcing wood for your epic island treehouse. Finally, an LED flashlight means you’ll never feel alone while those eerie monkeys call from the trees at night… Failing all that, it’s perfect for opening boxes at work. Dimensions: 3.35″ long x 1.77″ wide x 0.6″ deep Batteries: SR621SW (364) button cell (included) Weight: 3.5oz.