TSA prohibited items generally fall into categories of weapons, explosives, and flammable materials. Most famously, the 3-1-1 rule restricts liquids, gels, and aerosols to 3.4 ounces (100ml) or less per container in carry-ons. Strictly prohibited items in both carry-on and checked bags include explosives (fireworks, fuels, hand grenades), flammable liquids (lighter fluid, spray paint), and disabling chemicals (tear gas, chlorine). While some items like firearms or large tools (saws, drills) are banned from the cabin, they may be allowed in checked luggage if properly declared and packed according to specific regulations. In 2026, TSA continues to have a "zero tolerance" policy for realistic replicas of explosives or weapons. Sharp objects like box cutters or large scissors are also prohibited in carry-ons, though small safety razors and nail clippers are typically permitted.