Perhaps that luggage comes in the form of a smart suitcase, one that strives to make the travel experience easier with high-tech capabilities like built-in wireless chargers, electronic locks, and even GPS tracking. Also: Flying soon? This is a must-have iOS app for air travel But despite how convenient and practical smart luggage can be, airlines have become more strict about what pieces of travel gear are allowed and not allowed. This guide explains what counts as a smart suitcase and what every major airline’s policy is when you’re traveling with one. And now, here’s a list of the five most popular airlines and their respective travel policies that you should know before traveling: However, most airlines only apply restrictions to checked luggage with non-removable lithium batteries. If you can remove the lithium battery from the bag or just have a carry-on smart bag, you shouldn’t have problems flying with it. Also: 12 gift ideas for travelers this holiday season