Yes, you can mail a pocket knife. Ordinary folding pocket knives — along with fixed-blade hunting knives, kitchen knives, multitools, and utility knives — can go through USPS, FedEx, or UPS as long as the blade is packaged so it can’t cut a handler. What you cannot mail through the Postal Service are switchblades, gravity knives, and ballistic knives. The rule turns on how the blade opens, not on how long or sharp it is.
Which Knives Are Mailable
Federal law treats anything that could injure a person or damage the mail as nonmailable, but the Postal Service is allowed to accept those items when they’re packaged so they aren’t dangerous on their own or in transit.1Office of the Law Revision Counsel. 18 USC 1716 – Injurious Articles as Nonmailable A closed, wrapped pocket knife clears that bar easily. So do kitchen knives, hunting knives, and multitools.
The legal line has nothing to do with blade length or how aggressive a knife looks. It’s the opening mechanism. If you have to pull, push, or flip the blade open with your hand, it’s almost certainly legal to mail. If the blade fires open on its own the moment you press a button on the handle, it falls into a prohibited category.
Assisted-Opening Knives Count as Legal
This is where senders get nervous unnecessarily. A lot of everyday carry knives use an internal spring that helps push the blade the rest of the way open once your thumb starts it moving. They feel fast and mechanical, but they aren’t switchblades.
Federal law specifically exempts any knife with a spring or mechanism that biases the blade toward the closed position, where you have to apply force directly to the blade to overcome that bias.2Office of the Law Revision Counsel. 15 USC 1244 – Exceptions Your thumb pushes the blade itself, usually through a thumb stud or flipper tab, and the spring only assists partway through. A switchblade, by contrast, opens entirely on its own when you press a button or lever on the handle, without your finger ever touching the blade.3Office of the Law Revision Counsel. 15 USC 1241 – Definitions If you have to put your finger on the blade to start it, you have an assisted opener, and it’s mailable. Congress added this exemption in 2009 for exactly this reason.
Knives You Cannot Mail Through USPS
Three categories are flatly nonmailable, no matter how carefully you pack them:
- Switchblades — any knife whose blade opens automatically when you press a button or device on the handle.4Office of the Law Revision Counsel. 18 USC 1716 – Injurious Articles as Nonmailable – Section: 1716(g)
- Gravity knives — blades that open by gravity or a flick of the wrist. The federal switchblade definition covers any blade opening “by operation of inertia, gravity, or both,” which pulls gravity knives into the same ban.3Office of the Law Revision Counsel. 15 USC 1241 – Definitions
- Ballistic knives — knives with a detachable blade launched by a spring. These fall under the same mailing restrictions.5Office of the Law Revision Counsel. 15 USC 1245 – Ballistic Knives
Narrow exceptions exist for government procurement — deliveries to federal or state supply officers, National Guard procurement officers, and manufacturers filling those orders.4Office of the Law Revision Counsel. 18 USC 1716 – Injurious Articles as Nonmailable – Section: 1716(g) If you’re mailing your own knife to a friend or a buyer, those don’t apply.
One more layer sits on top of federal law: the destination’s own knife laws. Rules vary widely by state and city, and sending a knife that’s legal where you live to a place where it’s banned can cause trouble for both you and the recipient. A carrier won’t check local law for you.
Penalties for Mailing a Prohibited Knife
Putting a banned knife in the mail is a federal crime, and the penalties scale with intent. Knowingly mailing a nonmailable knife carries a fine, up to one year in prison, or both.6Office of the Law Revision Counsel. 18 USC 1716 – Injurious Articles as Nonmailable – Section: 1716(j) Mailing one with intent to injure carries up to twenty years.1Office of the Law Revision Counsel. 18 USC 1716 – Injurious Articles as Nonmailable
The Federal Switchblade Act adds a separate offense: transporting a switchblade in interstate commerce carries a fine up to $2,000, up to five years in prison, or both.7Office of the Law Revision Counsel. 15 USC 1242 – Introduction, Manufacture for Introduction, Transportation or Distribution in Interstate Commerce; Penalty Ballistic knives run higher, up to ten years for possession, sale, or importation.5Office of the Law Revision Counsel. 15 USC 1245 – Ballistic Knives If a postal worker finds a prohibited knife in transit, what follows is a federal investigation, not a returned package.
How To Package a Pocket Knife for Mailing
USPS Publication 52 requires that any sharp-pointed or sharp-edged instrument be packaged in a strong container with enough cushioning that the edges can’t cut through during normal handling. The Postal Service recommends an inner and outer container.8Postal Explorer. Publication 52 – Hazardous, Restricted, and Perishable Mail – Section: 443 Packaging and Marking Private carriers expect the same care.
Work from the blade outward:
- Close and lock the blade, then slide it into a sheath or wrap it in corrugated cardboard so no edge is exposed.
- Wrap the protected knife in bubble wrap or foam.
- Place it inside a smaller box or rigid container.
- Put that container inside a sturdy outer shipping box, filling empty space with crumpled paper so nothing shifts.
- Seal every seam with strong packing tape.
The standard is simple. Even if the outer box gets crushed or torn, no blade edge should be able to poke through and cut anyone. If you squeeze the wrapped knife hard and can’t feel the edge, you’re in good shape.
USPS Versus FedEx and UPS
Carrier choice matters because USPS and private shippers operate under different frameworks.
USPS follows 18 U.S.C. § 1716 directly. Switchblades, gravity knives, and ballistic knives are nonmailable outside the narrow government exceptions. For every other knife, USPS is straightforward and cheap: pack it properly, address it fully, done. When a switchblade does move under an authorized exception, nothing on the outside of the package can indicate what’s inside.8Postal Explorer. Publication 52 – Hazardous, Restricted, and Perishable Mail – Section: 443 Packaging and Marking
FedEx and UPS have a legal advantage. The Federal Switchblade Act exempts common carriers transporting switchblades in the ordinary course of business.2Office of the Law Revision Counsel. 15 USC 1244 – Exceptions That lets them ship categories USPS cannot. Both impose their own rules on top. UPS classifies firearms and weapons as restricted items that may require a contractual shipping arrangement, mainly for higher-volume shippers.9UPS. List of Prohibited and Restricted Items for Shipping FedEx may classify certain knives as dangerous goods, which triggers special handling surcharges.10FedEx. Dangerous Goods: How to Ship Ordinary pocket knives and folders move through both carriers without any of that.
International and TSA Situations
Mailing a knife overseas means complying with both U.S. rules and the destination country’s laws. USPS tells senders to check Publication 52 and its Individual Country Listings before shipping any restricted item abroad.11USPS. International Shipping Restrictions – What You Can Mail Internationally Countries define prohibited knives very differently, and a pocket knife that’s legal in the U.S. may be treated as a weapon at foreign customs.
On the way in, U.S. Customs allows standard utilitarian pocket knives — jackknives, scout knives, and other common folders — as long as they don’t meet the federal switchblade definition.12eCFR. 19 CFR 12.96 – Imports Unrestricted Under the Act Fixed-blade knives like machetes and sheath knives can also clear customs, though possessing them afterward may still run into state or local restrictions.
One last scenario worth flagging: if TSA catches a pocket knife in your carry-on at the airport, you don’t have to surrender it. Pocket knives are barred from carry-on but allowed in checked bags.13Transportation Security Administration. Pocket Knife You can usually go back and check a bag, hand it to someone not flying, or return it to your car. Some airports have mailing kiosks near security where you can ship the knife home to yourself. That’s almost always cheaper than replacing a good knife, so ask before you give one up.