In terms of legalities, TSA.gov states, “Spare (uninstalled) lithium metal batteries and lithium ion batteries, electronic cigarettes and vaping devices are prohibited in checked baggage.” Meaning, your luggage tracker’s success rate depends on its battery. Of course, we corralled only the best GPS luggage trackers that well, quite literally, fly (according to on-site reviewers). Scroll on for five handy tech devices that will free you from midflight nightmares for good.