The 3 refers to the amount of liquid you can have in a container, as it cannot exceed 3.4 ounces. However, you are not limited to one liquid container. The first 1 stands in for a quart-sized bag ...

Most frequent travelers know that each passenger is limited to 3.4 ounces (100ml) of liquids per item in their carry-on ...

According to The New York Times, the Transportation Security Administration (TSA) is rolling out computed tomography (CT) ...