A sheathed kitchen knife, a folding pocket knife or a hunting fixed blade ships internationally through USPS, UPS or FedEx to most destinations, so long as the origin rule bar is cleared and the destination country's import rule is not tripped. Switchblades are barred by 15 USC 1244 and never move by mail. USPS Publication 52 and the International Mail Manual carry the rest of the rule; both were read on pe.usps.com on 2026-08-11.
The origin carrier decides whether it accepts the parcel. The destination country decides whether customs releases it.
USPS Publication 52 Section 44 covers knives and sharp instruments and starts with the definitions. In its own words, sharp instruments include “all sharp-pointed or sharp-edged implements, such as knives, tools, ice picks, razor blades, stilettos, or similar devices.” A switchblade knife is “a blade that opens automatically by hand pressure applied to a button or other device on the handle, or through inertia, gravity, or both.”
For international parcels, USPS International Mail Manual Section 137 sets the rule: “Some knives and sharp instruments…may be mailed to certain countries under the conditions specified in the Individual Country Listings.” Every USPS international shipment carrying a knife has to be checked against the destination's Individual Country Listing for the current status of blade-type products.
Federal law (15 USC 1244) bars switchblade knives from the US mail except to procurement officers of civic, county, state and federal governments. USPS enforces the rule at pickup and refuses international shipments outright. UPS and FedEx maintain matching bans on switchblades in international service.
Blades that eject from the handle by spring or that open by centrifugal or gravitational force fall under the same federal category as switchblades in most contexts. Treat them as nonmailable and unshippable internationally.
A knife concealed as a pen, a lipstick, a belt buckle or a comb is a distinct import category in many destinations. Even when the origin carrier accepts it, the destination customs authority typically refuses release.
Even a kitchen knife or a folding pocket knife can be refused at customs on the far side, and the categories that trigger a hold vary. The USPS Individual Country Listings are the authoritative source per destination; a short survey of the major markets shows the flavour of the rules.
| Destination | What is commonly restricted or prohibited | Notes |
|---|---|---|
| United Kingdom | Flick knives, gravity knives, disguised knives, zombie-style blades, curved swords, some one-hand-opening folders | Import restrictions administered by UK Border Force under the Offensive Weapons Act; sales and possession rules mirror them at retail |
| Germany | Fixed-blade knives with certain lengths, butterfly knives, one-hand-opening or fixed-blade combat knives under the Waffengesetz | Kitchen and utility knives are generally admitted; category depends on the German weapons law classification |
| Australia | Flick knives, butterfly knives, ballistic knives, push knives, most concealed blades | Federal Customs (Prohibited Imports) Regulations enforce a broad list; permits available in limited circumstances |
| Canada | Automatic (spring-assisted) knives, gravity/centrifugal knives, butterfly knives, disguised blades | Kitchen and standard folding knives admitted; automatic categories treated as prohibited weapons |
| Japan | Fixed blades exceeding 15 cm and certain folders exceeding 6 cm blade length under the Firearm and Sword Control Law | Kitchen knives ship regularly; concealment or non-declared categories often result in seizure |
The pattern to notice: automatic and concealed knives are barred almost everywhere; kitchen and utility knives usually clear; the middle ground of folders with locking blades, tactical folders and long fixed blades is where destinations diverge sharply. When in doubt, look up the destination's own customs authority — the sending carrier's acceptance is not a promise of release at the border.
Priority Mail International and Priority Mail Express International accept knives to countries permitted in the Individual Country Listing. The carrier is the cheapest on light parcels and the customs form is generated at label purchase.
Both accept most knives on their international services, subject to their own prohibited-items lists (switchblades excluded). Speed and tracking are stronger; declared value and duty pre-payment via DDP are available on both networks.
Cutlery-industry logistics firms handle categories that are edge cases for the general carriers, particularly high-value chef knives and Japanese sword-adjacent products. Slower to book, more paperwork, cleaner customs release.
Rate-shop the packed parcel side by side on the calculator before committing. On light kitchen knives, USPS is usually cheapest; on heavy fixed blades or dense boxes, UPS or FedEx often win once duty behavior is factored.
A knife on a customs form as “gift” or “kitchenware” is what causes a hold. Write the actual item: chef knife, 8-inch stainless steel blade, or folding pocket knife, 3-inch locking blade, or hunting fixed blade, 5-inch high-carbon steel. Add the HS classification: knives sit in Chapter 82, mostly under headings 8211 (knives with cutting blades) and its subheadings. Enter a truthful value in US dollars and the country of manufacture. A specific declaration clears customs; an evasive one triggers the inspection queue.
USPS Pub 52 Section 44 requires knives and sharp instruments to be “packaged so the sharp point or edge cannot cut through the wrapper.” Sheath the blade, wrap the sheathed blade in bubble wrap, brace it inside the box so it cannot shift, and cap the tip with a folded piece of corrugated. A blade that pierces the outer box is pulled by the sorter, either returned or destroyed. UPS and FedEx enforce the same principle at their sortation hubs.
Destination rules change without notice. Always confirm the current USPS Individual Country Listing for the destination, the carrier's own prohibited items list and the destination customs authority before shipping.
Most kitchen knives ship internationally to most destinations when the blade is sheathed, the box is marked and the customs form declares the item. USPS states in IMM Section 137 that some knives may be mailed to certain countries under the Individual Country Listings; the destination's own import rules decide the rest.
USPS defines a switchblade as a knife with a blade that opens automatically by hand pressure on a button or by inertia or gravity. Federal law (15 USC 1244) bars switchblades from the mail entirely except to procurement officers of civic, county, state and federal governments. UPS and FedEx also refuse switchblades in international shipments.
The answer is destination-specific and changes. USPS points shippers to the Individual Country Listings on pe.usps.com for each destination. The UK, Germany, Australia and Ireland all restrict specific categories (locking folders, flick knives, one-hand openers, blades above certain lengths) and can refuse a parcel at customs even when the sending carrier accepted it.
Describe the item specifically — kitchen chef knife, folding pocket knife with lock, hunting fixed blade — with the correct HS code (chapter 82 for hand tools including knives), a truthful value in US dollars and the country of origin. A vague form is the fastest way to lose a parcel to a customs hold.
USPS requires sharp instruments to be securely fastened so the edge or point cannot cut through the wrapper and injure a mail handler. Sheath the blade, wrap in bubble, brace it in the box so it does not shift, and cap the tip with a folded piece of corrugated. A knife that pierces the outer box is either returned or removed from the mailstream.