Lithium batteries are the party foul of air travel. You can bring power banks and spare batteries for phones and laptops in your carry-on, but never in checked luggage. Why? Because if a lithium battery catches fire, flight attendants want to be able to put it out—not watch it burn in the cargo hold.
But here’s the catch: you cannot bring large hoverboards (the ones with massive lithium batteries) on most U.S. airlines. They’re considered too risky. So if you were hoping to cruise through the terminal like a futuristic mall cop, you’ll have to rethink your entire travel personality.
Little-known rule: Smart luggage with built-in batteries is now banned from many airlines unless the battery is removable. So that fancy $500 suitcase you bought? You might have to check the bag and carry the battery in your hand like a weirdo.
The Obvious Ones You’ll Still Forget
Recreationally, you cannot bring marijuana through airport security, even in states where it’s legal. Federal law still reigns, and TSA agents are technically looking for threats, not drugs—but if they find your gummy bears, they’ll call the cops. Same goes for fireworks, sparklers, and even those confetti poppers for New Year’s. They’re considered explosives.
Then there’s alcohol: you can bring mini bottles (under 3.4 oz) that fit in your quart bag. But a full bottle of wine? No way—unless you buy it after security at the duty-free shop. And even then, you’ll need it sealed in a special tamper-proof bag.
Oh, and one more: you cannot bring a snow globe over 3.4 ounces. That tiny souvenir from your Swiss ski trip? It’s basically a liquid bomb in sparkly form. Leave it for the checked bag or the trash bin.
