“Smart bags, also known as smart luggage, have become more popular over the last few months, and they are expected to be a popular gift this holiday season,” said American Airlines (AAL). “However, smart bags contain lithium battery power banks, which pose a risk when they are placed in the cargo hold of an aircraft.”

The bags generally have USB ports where customers can recharge their phones and other devices. They might also have GPS to track the bag’s location in case it gets lost, electronic locks and a weight scale to prevent overpacking. Some even a motor to propel the bags so that they can double as a scooter or just follow their owner around the airport.