Cordless hair straighteners that contain lithium metal or lithium ion batteries or are gas or butane fueled are only allowed in carry-on bags. A safety cover must be securely fitted over the heating element.

Packing a hair straightener in a carry-on is perfectly legal under TSA and international aviation rules, as they are considered non-dangerous electrical appliances. To pack it efficiently and safely, you should wait until the device is completely cool to avoid melting any synthetic fabrics in your bag. A great tip is to use a heat-resistant travel pouch or even a thick oven mitt to wrap the plates; this protects the rest of your luggage and allows you to pack it even if you're in a hurry to check out of your hotel. You do not need to remove it from your bag at the security checkpoint, but it’s best to place it near the top or in an outer pocket just in case the X-ray technician wants a closer look at the dense heating elements. To prevent the cord from tangling or fraying, fold it loosely in a "figure-eight" pattern rather than wrapping it tightly around the handle, which can damage the internal wiring over time. If you are traveling internationally, remember to pack a plug adapter, but check if your straightener is "dual voltage" (110-240V) so you don't fry it when you plug it in abroad.