In recent years, drones have become smarter flyers, faster racers and better photographers. But for the most part, they’re still too big and bulky to carry around comfortably, which can turn off more-­casual consumers. Not so with DJI’s Mavic Pro, which debuted in September; it’s got all the trimmings of a state-of-the-art drone—obstacle-avoidance technology, a 4K camera and the ability to track subjects while ­flying—but it can also fold down to the size of a loaf of bread, smaller than any of its competitors. Realizing that goal required DJI’s engineering team to “rethink all the aspects” of a typical drone, says Darren Liccardo, who helped lead the project. But ultimately, he adds, the effort paid off: because of its smaller size, the Mavic Pro is more nimble and less prone to ­accidents—yet another selling point that could attract new users.