01The rules in detail
TSA prohibits all knives in the cabin except plastic or round-bladed butter knives. Multi-tools with a blade go in checked bags; those without a blade (pliers, screwdrivers under 7 in) are allowed in carry-on in the US. The EU and UK technically permit blades up to 6 cm, but many airports and countries are stricter, and connecting through the US will confiscate them. Some countries (UK, Japan) also restrict carrying knives in public regardless of aviation rules.
02Tips
- Check it or leave it; confiscation is guaranteed if you forget.
- Blade-less Leatherman-style tools are cabin-friendly in the US.
03Frequently asked
Can I bring a pocket knife in my carry-on?
No. Any knife with a blade is banned from carry-on in the US and most countries (the UK/EU allow blades up to 6 cm at some airports, but don't rely on it). Multi-tools with blades: checked only. Blade-less tools are usually fine.
Can I pack a pocket knife in checked luggage?
Yes. Any knife with a blade is banned from carry-on in the US and most countries (the UK/EU allow blades up to 6 cm at some airports, but don't rely on it). Multi-tools with blades: checked only. Blade-less tools are usually fine.
Are the rules the same outside the US?
Mostly similar for liquids and batteries, which follow international standards, but sharp objects, tools, lighters and self-defense items vary widely by country. Check the departure airport's rules and the destination's laws.
TSA and other agencies allow officers to refuse any item they judge unsafe, and rules change. This page summarises published guidance as of the verified date; confirm on tsa.gov or your airport's site before packing anything unusual.