The knife laws that decide what you carry
Portland, New York, Chicago, Tokyo, Berlin, Copenhagen. Every one of them draws the line somewhere different, and that's not a legal briefing, it's a great excuse. A rule is just a filter, and a filter is how you turn an overwhelming category of "knives" into a short, specific, actually interesting list.
We are not lawyers. We haven't read most of these places' actual statutes in full, and knife law varies wildly enough, city to city and country to country, that we wouldn't trust anyone who claimed otherwise. Treat everything below as a fun starting point, not legal advice, and check the real, current rule yourself before you rely on any of it.
A friend once asked why my collection was starting to lean toward small, unremarkable-looking knives, instead of the giant, flashy, purple sparkled knives he saw on social media, and the honest answer involved four different countries' legal codes.
Every one of these knives below is the answer to a specific constraint, not a top pick pulled from a vacuum. That's the whole appeal. A budget cap makes for a better list than "here are nine good knives." A size limit does the same thing. So does a law.
Portland to Portland
No blade length limit, automatics have been fully legal since 2015, and the only real restriction is concealing a short list of dedicated combat knife styles you were never going to carry anyway. Basically anything in the lineup qualifies here, which is itself the whole point of including it. With no actual law drawing the line, what's appropriate becomes a matter of judgment instead, and that's exactly the kind of call our readers are equipped to make well, given the site they're already reading.
Same country, same name, a completely different posture. The state baseline is permissive, but the city carves out its own stricter rules in specific zones, a 3.5-inch cap and no spring or centrifugal opening in parks and on the streetcar, so the same knife can be legal on one block and a problem two blocks later.
NYC isn't one rule, it's several stacked on top of each other: a 4-inch cap, a separate rule that the knife can't be visible regardless of length, and a flat statewide ban on switchblades and a few other mechanisms no matter how it's carried. It's also home to one of the more consequential knife law stories in the country, worth knowing plainly rather than dramatized.
New York's gravity knife law is the version of this story most people have actually heard of, a broad functional test, whether the blade could be flicked open and locked with the wrist, that ended up catching far more ordinary hardware-store folders than actual gravity knives. Rules built this way aren't uncommon, and they can conceivably bite even the most well-intentioned person. This particular history is heavy enough that it deserves its own piece, and we'll do it properly, with real research, another time.
On a personal note: this is also the reason I only ever use a deep carry clip. Any part of the knife visible above the pocket line still feels wrong to me, legal or not. And on days I expect to run into any kind of security checkpoint, I carry the smallest, most unmistakably-a-tool knife I own, something like a Victorinox, specifically so the conversation never starts. My own adherence to rules like this has shifted over the years, roughly in this order: bravado, then necessity, then eventually just compliance.
Illinois doesn't preempt its cities, so Chicago drew its own flat line: 2.5 inches, no exceptions, plus its own bans on knuckle knives and finger-ring knives. Spyderco built a knife specifically for this rule and named it after the city. The Chicago runs a 2-inch blade, comfortable margin under the actual limit, which is a nicer way to handle a hard number than cutting it close.
Same caveat as New York: the broad, functionally-defined version of this kind of law isn't unique to one city, and it's worth assuming it could apply here too rather than getting comfortable.
This one's a genuinely recent story. Louisiana passed statewide knife preemption in August 2024, which specifically forced New Orleans to repeal its own stricter local rules, an old switchblade ban and a roughly 2.75-inch concealed limit, within six months. As of this year, there's effectively no blade length restriction here at all. A city that used to be the strict one just got dragged into being the loose one.
Europe, mostly grouped by what they actually agree on
Western Europe mostly distrusts a knife that opens fast and locks. Each country just got there differently, and a couple of them turned out to be more interesting than the rule itself once you look closely.
France won't allow the lock at all, doesn't matter how you get there, which makes for an uncomfortable fact: the Virobloc twist-ring on a classic Opinel legally counts as a lock, meaning the single most iconic, ubiquitous knife in the entire country technically fails its own nation's rule. Whoever wrote the law almost certainly never noticed. Opinel apparently did, because in 2026, after seventy years of the Virobloc unchanged, they released a new mechanism called the Opiflex, a detent system that holds the blade open under spring tension instead of actually locking it, built specifically to stay legal in places exactly like this.
Germany's rule is more surgical than a flat ban: it's not the lock that's illegal and it's not one-hand opening that's illegal, it's the two of them together. A one-hand opener that doesn't lock is fine. A two-hand opener that locks is fine. That's exactly the trio in our slip joint piece, the Urban, the Squeak, the UK Penknife, on the compliant side of the rule. Germany's own most iconic traditional knife, the Mercator K55K, the "Black Cat" knife since 1867, is a perfect real-world example from the other direction: opened with two hands via nail nick, then locked. Same rule, satisfied from opposite ends.
Switzerland restricts one-hand-opening and locking knives generally, but the law carves out an explicit exemption, and it's worth being precise about what for: not a brand, a design. "Schweizer Taschenmesser," Swiss pocket knives as a type, are written into the law as exempt, done deliberately to protect a whole domestic industry, not one company. Modern lookalikes that add a lock or one-hand opening, even from Swiss makers, don't get the same pass. The shape is protected. The shortcut isn't.
Denmark skips the lock conversation entirely and just wants both hands on the job, exactly why the GiantMouse Farley earns its spot here, a genuine two-handed slip joint designed by Jesper Voxnaes and Jens Ansø, both Danish, neither of whom needed to think about their own country's carry law for a second, because the knife they'd already built complied on its own.
When the law is about you, not the knife
Sweden's law barely mentions the knife at all, no length, no lock, no opening method. It's about you, and whether you've got a real reason to have it on you in that specific moment.
Italy runs the same "justified reason" logic as Sweden with far less patience. Sightseeing doesn't count as a reason, and a new decree that landed this year turned any locking folder 5cm or larger into a real problem if you can't justify carrying it. While the US trended looser in 2026, Italy just tightened.
The UK just picked a number: three inches, non-locking, done. It's still the cleanest, easiest rule on this entire list, and it's the reason the UK Penknife carries the name it does. One odd detail worth knowing: that number really is three inches in the actual law, not a converted 7.6cm, in a country that otherwise runs on metric. The UK's newest knife legislation, a 2024 ban on so-called "zombie-style" knives, still measures its own threshold in inches too. Knife law here just never made the switch.
The far end of the spectrum
I haven't been, though I want to go. When I do, I plan on being completely tool-less, no knife, no multitool, not even a keychain prybar or bottle opener. That's not a hunch. Every bit of research we could find on this pointed the same direction: for a foreigner with no local language ability, carrying anything at all just isn't worth the risk, whatever the letter of the law technically allows. I don't live there and I won't pretend to understand how these laws actually apply to residents day to day. As a visitor, the respectful and low-risk move is simply to leave it all at home.
The carry threshold here is roughly 6cm, about 2.4 inches, without a specific justified reason like work or hunting, smaller than almost anywhere else on this list. The Flytanium Minim and the Spyderco Honeybee both clear it with real room to spare. The Grasshopper, the largest of that Spyderco trio, sits right at the edge of the number depending on which spec sheet you trust, close enough that we're not doing that math for you. Go check the real number yourself before you rely on ours.
None of this is a legal guide, and it was never trying to be one. It's just proof that a rule, any rule, is a genuinely good way to end up with a shorter, better list of knives than starting from scratch ever would.