What are the rules regarding packing liquids and toiletries on air planes?

When packing liquids and toiletries for air travel, the Transportation Security Administration (TSA) generally requires that all liquids, gels, and aerosols must be in containers of 3.4 ounces (100 milliliters) or less. These containers must fit into a single, quart-sized clear plastic bag, and each passenger is allowed only one such bag. Additionally, items like medications and baby formula may be exempt from these restrictions but should be declared at security checkpoints. Always check with your airline for any additional specific regulations.