No, you cannot take liquid bleach on a plane in 2026, regardless of whether it is in your carry-on or checked luggage. Bleach is classified as a hazardous material (oxidizing solid/liquid) by the TSA and international aviation authorities (IATA) because it is corrosive and can react dangerously with other substances. Even a small leak could damage the aircraft's aluminum structure or create toxic fumes in the pressurized cabin. If you are caught with bleach at a security checkpoint, it will be confiscated immediately, and you could face a fine. If you need to whiten clothes or sanitize a space while traveling, the safest and legal alternative is to pack dry bleach tablets or bleach pens, which are generally permitted because they are not in a spillable liquid form. However, even with solids, it is wise to keep them in their original packaging to avoid suspicion. For general cleaning, many travelers now opt for hydrogen-peroxide-based wipes or standard disinfecting wipes, which are fully permitted and much safer for use in confined travel environments.