Most travelers know about liquid restrictions at TSA, but there are some exceptions that allow you to bring certain things in larger quantities. Prescription medications, baby formula, and other medical liquids are allowed in containers greater than 3.4 ounces, but they're still among the most common reasons bags get pulled aside. "Even though they are permitted, officers may need to screen medically necessary liquids if the quantity is greater than 3.4 ounces," a TSA spokesperson says.
That quick check wasn't random. In response to safety concerns surrounding lithium-ion batteries, the TSA has stepped up enforcement and is paying closer attention to power banks during security screenings. "TSA has not 'banned' power banks. However, they are only allowed in carry-on bags," a spokesperson told Travel + Leisure. Most standard power banks fall under the FAA's 100Wh (or 27,000mAh) limit, but higher-capacity models are increasingly common, especially among travelers looking to charge laptops or multiple devices.
The United States Department of Homeland Security announced on Tuesday that it was scrapping a policy requiring people to take off their shoes while passing through airport screenings.