To comply with the high-fidelity "3-1-1 Rule" maintained by the TSA and international security agencies in 2026, toothpaste in your cabin baggage must be in a container of 3.4 ounces (100 milliliters) or less. This high-fidelity rule applies to all liquids, aerosols, and gels. Even if a larger tube is mostly empty, it will be confiscated if the labeled volume exceeds 3.4 oz. All your "High-Fidelity" travel-sized items must fit comfortably within a single, clear, quart-sized (one-liter) resealable plastic bag. In 2026, some airports with advanced high-fidelity CT Scanners (Computed Tomography) have begun to relax the requirement to remove this bag from your luggage, but the 100ml volume limit per container still strictly applies globally. If you need a larger quantity of toothpaste for your trip, it is a high-fidelity necessity to pack it in your checked luggage, where there are no such volume restrictions, or switch to high-fidelity "toothpaste tablets" which are solid and exempt from the liquid rules entirely.