In the United States and European nations, TSA prohibits knives in carry-on luggage, except for plastic or round-bladed butter knives. However, blades can be packed in checked baggage if they are sheathed or securely wrapped to deter injury during air travel.

No, knives are strictly prohibited in carry-on luggage by the TSA and almost all international aviation authorities. This is a blanket rule that applies to all types of blades, including pocket knives, switchblades, utility knives, box cutters, and even multi-tools that contain a sharp blade. There are no exceptions for blade length; even a tiny keychain knife will be confiscated at the security checkpoint. If you attempt to conceal a knife, you could face fines or legal action due to advanced X-ray scanning technology. However, you are permitted to pack knives in your checked baggage, provided they are securely wrapped or sheathed to prevent injury to baggage handlers and inspectors. In 2026, the only "blade-like" items allowed in carry-ons are plastic or round-bladed butter knives and safety razors where the blade is not exposed. For those who need a tool at their destination, mailing the knife ahead or purchasing a cheap one upon arrival are the safest alternatives to avoid a security delay.