According to the TSA's 3-1-1 liquids rule, any item that is a liquid, aerosol, gel, cream, or paste must be placed in a single, quart-sized, clear plastic bag if you are carrying it through security. Common travel items that fall under this rule include toothpaste, shampoo, conditioner, mouthwash, lotion, and liquid makeup (like foundation or mascara). The rule specifically mandates that each individual container must be 3.4 ounces (100 milliliters) or less; even if a larger bottle is only half-full, it will be confiscated if the container's marked capacity exceeds the limit. Other items that travelers often forget include peanut butter, honey, hair gel, and spray deodorants. In 2026, some airports equipped with advanced 3D "CT scanners" allow you to keep these items inside your luggage, but the 3-1-1 bag remains the legal requirement for the vast majority of security checkpoints worldwide. Separating these items into a clear bag facilitates the screening process and prevents additional manual bag searches. Exceptions are generally made only for essential medications, baby formula, and breast milk, which should be declared to the officer for separate inspection.