When you fly, the changing altitudes that an airplane experiences cause gas and air to expand during a flight. This, in turn, can cause leaks in your carry-on from everything from toiletries to water bottles, according to The Points Guy.
CiCi told Insider that in her experience observing passengers' TSA-approved liquids, "people's stuff leaks all over the place," she said. To help, CiCi said she has a few tips.
First, squeeze as much air out of the bottle as possible. This will help prevent expansion, she said.
Perhaps most importantly, she said, choose travel-sized containers wisely. CiCi said she's tried dozens of different travel-sized containers specifically designed not to leak, but the ones she's had the most success with have screw-on caps instead of snap-on tops.
She said she thinks these create a tighter seal, which helps prevent leaking.