A customs declaration
A description of the contents, a declared value and, once the shipment is large enough, a tariff classification have to travel with the box, filled in before a label is ever produced rather than tacked on afterward.
Glossary
International shipping, defined
International shipping means moving a physical parcel or letter to an address in a different country than the one it left from, rather than to another city or state in the same one. The border, not the distance, is what does the work: a box travelling 300 miles across a national line picks up a customs declaration, a duty bill the destination country assesses on the recipient, and a shorter list of carriers willing to make the crossing, none of which a domestic parcel ever carries. SMKlog's own checkout sells that crossing live to four countries today — Canada, the UK, Germany and Australia — and the numbers below are two of those lanes, quoted the same day for the same box.
Plain definitionLive checkout, 2 lanesCaptured 2026-08-31
The border does the work
Distance barely moves the price. Crossing a line on the map is what adds the paperwork and the bill.
What crossing a border adds to an ordinary label
A duty bill at the door
The destination country's own customs authority sets the amount, and on every SMKlog lane it is collected from the recipient on delivery, not folded into what the sender pays at checkout.
A shorter carrier list
Not every domestic option survives the border. On a 2026-08-31 checkout capture, USPS returned no rate at all on any of the four international lanes tested, despite being a routine cheapest option domestically for a box the same size.
Two lanes, the same box, two different bills
To show the definition moving an actual price rather than staying abstract, the same test parcel — a 0.9 kg box, 20 × 15 × 10 cm, from Berkeley Heights, NJ 07922 — was quoted live to the nearest and the farthest of SMKlog's four sold countries, captured 2026-08-31.
| Destination | Cheapest returned | Fastest returned |
|---|---|---|
| Canada | UPS Worldwide Economy DDU $25.61 · 8 business days | FedEx International Priority $35.67 · 1 business day |
| Australia | UPS Worldwide Economy DDU $40.05 · 8 business days | DHL Express Worldwide Non Doc $59.09 · 3 business days |
Same box, same day, and the price still moves by more than fourteen dollars on the cheapest line depending only on which country name went into the destination field. That gap, and the DDU letters printed right into one of the service names, is what the word "international" is doing to the quote — not the extra distance to Sydney over Toronto, which the fastest column barely reflects at all.
Where this comes from
- SMKlog's own live quote endpoint, quote-api.smklog.com — the Canada and Australia rows above, captured 2026-08-31 for a 0.9 kg box from Berkeley Heights, NJ 07922.
Carrier rates change lane by lane and day by day. Treat the numbers above as what checkout returned on the date shown, and quote your own box before relying on either figure.
What that definition means for an actual box
What does "international shipping" mean?
Moving a parcel or letter to an address in a different country than the one it started in. That single fact triggers a customs declaration, a duty bill assessed by the destination country rather than the seller, and a shorter list of carriers and services willing to take the box across at all.
Is international shipping just a pricier version of domestic shipping?
No, it is a different transaction, not a surcharge on the same one. A domestic label never carries a customs form or a destination-country duty bill, and the carrier list narrows once a border is added, all regardless of how short or long the actual distance is.
Who pays the customs duty on an international shipment?
The recipient, on every lane SMKlog's checkout sells today. That arrangement, billed on delivery rather than folded into the label price, is what carriers label DDU, and it runs by default on all four countries currently sold: Canada, the UK, Germany and Australia.
Does the same carrier that ships domestically also ship internationally?
Not automatically, and not with the same service list. On a live SMKlog checkout quote captured 2026-08-31, USPS returned no rate at all on any of the four international lanes tested, while it is ordinarily the cheapest option for a small domestic box the same size.
Which countries can SMKlog ship to today?
Four: Canada, the United Kingdom, Germany and Australia, quoted live at checkout with the customs declaration built into buying the label. A box addressed anywhere else is priced and cleared through freight review instead, by a person rather than the calculator.