While knives are generally illegal to bring in carry-on luggage, certain types are permitted in checked baggage. Fixed Blade Knives: These knives have a blade permanently attached to the handle. They are allowed as long as the blade is within 7 inches.

In 2026, the TSA (and most international aviation authorities) has no specific "length limit" for a knife that is packed in your checked luggage. You can legally transport everything from a small pocket knife to a large chef’s knife or even a ceremonial sword, provided they are safely sheathed or securely wrapped to prevent injury to baggage handlers and inspectors. However, it is strictly forbidden to carry any knife with a sharp blade (except for plastic or round-bladed butter knives) in your carry-on bag, regardless of its size. If you are checking a large or particularly "tactical" knife, it is a high-fidelity safety tip to declare it at the check-in counter, though not always required. Always check the local laws of your destination country as well; while the airline may allow a large survival knife in your checked bag, carrying that same knife in public upon arrival could violate local "concealed weapon" or "blade length" statutes in cities like London or New York.