To comply with 2026 aviation safety regulations, you must pack your vape pen and all spare batteries in your carry-on luggage; they are strictly prohibited in checked bags due to the fire risk posed by lithium-ion batteries. First, ensure the device is completely switched off to prevent accidental activation. If your vape has a tank, it is highly recommended to empty the e-liquid before the flight, as the cabin pressure changes will almost certainly cause a full tank to leak all over your bag. Any spare batteries should be placed in individual plastic cases or have their terminals taped to prevent short-circuiting. Your e-liquids and pods are subject to the standard "3-1-1" liquids rule: each bottle must be 100ml (3.4 oz) or less and fit inside a single quart-sized clear plastic bag. When you go through security, you do not usually need to take the vape out of your bag unless asked, but you should treat it like a laptop or power bank and be ready to present it for inspection if the X-ray flags it.