Can You Legally Ship Knives in the Mail? USPS, FedEx, and Penalties

Shipping knives in the mail is legal for most common blades — kitchen knives, pocket knives, folding knives, and fixed-blade hunting knives — as long as the package is built to keep the edge away from the box walls. The rules tighten sharply for switchblades, butterfly knives, and ballistic knives, which cannot go through USPS at all. For those, a private carrier like FedEx or UPS is often the only legal option, because federal law treats the postal system and contract carriers differently.

Knives You Cannot Send Through USPS

Federal law makes switchblades and ballistic knives “nonmailable.” Under 18 U.S.C. § 1716, you cannot deposit them in the mail or have USPS carry them, and the penalty for knowingly doing so runs up to one year in prison, jumping to twenty years if the mailing was done with intent to injure.1Office of the Law Revision Counsel. 18 USC 1716 – Injurious Articles as Nonmailable

The federal definition of “switchblade” is broader than most senders assume. It covers any knife with a blade that opens automatically from a button or device in the handle, or by the force of gravity or inertia.2Office of the Law Revision Counsel. 15 USC 1241 – Definitions Three types get caught by that language:

  • Traditional push-button switchblades where the blade springs out on its own.
  • Butterfly knives (balisongs). U.S. Customs and Border Protection classifies balisongs as switchblades because the blade deploys through a flipping motion using gravity and inertia. The customs regulations name them alongside switchblades and gravity knives explicitly.3eCFR. 19 CFR Part 12 – Switchblade Knives
  • Ballistic knives, which have a detachable blade propelled by a spring.1Office of the Law Revision Counsel. 18 USC 1716 – Injurious Articles as Nonmailable

If you can deploy the blade without manually pulling it open with pressure on the blade itself, it likely falls under this ban. Do not put it in a USPS mailbox or hand it to a postal clerk.

Knives You Can Mail Through USPS

USPS accepts most non-automatic knives. Chef’s knives, folders opened by hand, pocket knives, and fixed-blade knives all qualify, and the Postal Service treats them as “sharp-pointed or sharp-edged instruments” that need strong containers and enough cushioning to keep the edge from cutting through during handling.4Postal Explorer. Publication 52 – Hazardous, Restricted, and Perishable Mail – Section: Packaging and Marking

One rule applies even when a restricted knife qualifies for one of the narrow legal exceptions: the outer packaging cannot carry any marking indicating a knife is inside.4Postal Explorer. Publication 52 – Hazardous, Restricted, and Perishable Mail – Section: Packaging and Marking That standard is worth following for ordinary knives too. Plain boxes attract less handling attention and less damage.

Why FedEx and UPS Are Different

The Federal Switchblade Act, which governs interstate commerce, has an exception written into it for common carriers and contract carriers transporting switchblades in the ordinary course of business.5Office of the Law Revision Counsel. 15 USC Ch. 29 – Manufacture, Transportation, or Distribution of Switchblade Knives FedEx and UPS fall inside that exception. USPS does not, and its own governing statute prohibits the same knives from the mail regardless.

The practical result: an automatic knife you cannot legally mail can often move legally through a private carrier. Each company still sets its own rules on top of federal law.

FedEx generally accepts knife shipments that comply with applicable laws and are properly packaged. Depending on the type, the shipment may require an adult signature at delivery.

UPS lists firearms and weapons as restricted items that can be shipped on a contractual basis for shippers with regular volume who comply with all laws and regulations.6UPS. List of Prohibited and Restricted Items for Shipping Ordinary knives are not typically classified as weapons and move through standard services, but a switchblade or tactical knife could be flagged under the weapons category and require a contractual arrangement. Call the carrier before shipping anything unusual.

Assisted-Opening Knives Are Not Switchblades

This is where senders trip themselves up unnecessarily. Many popular everyday-carry knives from brands like Kershaw, Benchmade, and Zero Tolerance use a spring or torsion bar that helps the blade the rest of the way open once you push a thumb stud or flipper tab. These are assisted-opening knives, and Congress carved out a specific exception for them in 2009.

The exception covers any knife containing a spring, detent, or other mechanism that biases the blade toward the closed position, where physical effort applied to the blade by hand, wrist, or arm is required to overcome that bias and open the knife.5Office of the Law Revision Counsel. 15 USC Ch. 29 – Manufacture, Transportation, or Distribution of Switchblade Knives If you have to push the blade to start it moving, it is not a switchblade under federal law. Ship it through any carrier.

How to Package a Knife for Shipping

Poor packaging is the fastest way to have a perfectly legal shipment cause trouble. A blade that punctures its box during transit can injure a worker, and the package gets flagged or destroyed. The same basic precautions satisfy every carrier:

  • Secure the blade. Use a fitted sheath, blade guard, or wrap the edge tightly in heavy cardboard held with tape. The edge should not be able to reach the packaging walls.
  • Use two containers. USPS recommends an inner container inside a sturdy outer box, and it is good practice everywhere.4Postal Explorer. Publication 52 – Hazardous, Restricted, and Perishable Mail – Section: Packaging and Marking
  • Cushion against movement. Fill dead space with bubble wrap, foam, or crumpled paper so nothing shifts when the box is shaken.
  • Keep the outside plain. No stickers, stamps, or descriptions suggesting a knife is inside.

Ship folding knives in the closed position. On fixed blades, pay extra attention to the tip, which is the most likely point to puncture packaging. Wrap it separately if the sheath does not fully cover it.

State Laws at the Destination

A knife that is legal under federal law can still be illegal to possess in the state where it is going. State knife laws vary on blade-length limits, which opening mechanisms are allowed, and whether the design itself is banned. A shipper who knowingly sends a prohibited knife into a state that bans it can face distribution charges there, and the recipient can face possession charges.

For online sellers, this is where most legal exposure sits. A disclaimer on a website does not protect you from shipping a prohibited item into a state that bans it. Check the destination state’s law before shipping anything more exotic than a standard kitchen or pocket knife.

International Shipments

Many countries prohibit importing switchblades, butterfly knives, and fixed blades above certain lengths, and a knife that is unrestricted in the United States can be confiscated at the destination border with no compensation.

On the U.S. side, CBP enforces its own switchblade ban at import, and shipments in violation are subject to forfeiture.3eCFR. 19 CFR Part 12 – Switchblade Knives For any international shipment, describe the item honestly on the customs declaration. Include the knife type, blade length, and material. Vague labels like “tool” or “gift” invite inspection.

Penalties for Getting It Wrong

The consequences depend on which law you violate and which carrier you used.

State charges can stack on top of these. If you are sending anything beyond common household or pocket knives, confirm the knife type against federal definitions, pick a carrier that legally accepts it, package it so the blade cannot cut its way out, and check the law at the destination.