You can bring a whole cake through security, but you cannot bring a jar of jam. Let that sink in. You can have a half-eaten burger, but not a 4-ounce bottle of hand sanitizer (well, until recently—pandemic rules changed that one for a hot minute).
Also, solid toiletries are your best friends. Bar soap, solid shampoo bars, deodorant sticks—these are the heroes of the carry-on world. They don’t count toward your liquid limit, and they won’t explode in your bag like a tiny, smelly volcano.
One more weird fact: if you have a medical condition, you can bring larger liquids, but you’ll need to declare them. The TSA agent will then eye your giant bottle of contact lens solution like you’re using it to power a jet engine. Just smile and say, “It’s for my dry eyes,” and they’ll wave you through.
The Surprising Exceptions
Believe it or not, you can bring frozen liquids through security, as long as they’re solid at the checkpoint. So yes, you can theoretically pack a frozen bottle of water, but if it starts melting while you’re in line? Congratulations—you’ve just created a liquid. And the TSA will confiscate it with the glee of someone winning a carnival prize.
Also, baby formula and breast milk are exempt from the 3-1-1 rule. But you’ll have to tell the agent it’s for a baby, and they will ask if you have a baby. Pro tip: do not lie about this. They’re not idiots.
Toiletries 3-1-1: Complete Packing Guide and Checklist - Muy Miles
And here’s the kicker: dry shampoo powder is fine, but aerosol dry shampoo must be under 3.4 ounces. Because apparently, the TSA is okay with you looking freshly washed but not with the pressure of a spray can near an engine.
