What has to be written in a parcel's contents description?
The specific item, not the category it belongs to. USPS's own customs guidance gives the example directly: instead of “tools,” the form has to say “a screwdriver” or “power drill.” A vague word covers too many tariff lines for the destination country to classify the parcel, and that is what a customs hold is usually waiting on.
Does the declared value have to match what I actually paid?
Yes. The value line is what duty, tax and any low-value exemption get calculated against, so understating it is not a discount — it is a false declaration on a legal document, and USPS's own page states plainly that the receiving country can reject, return or destroy a parcel over a customs form that does not hold up.
If I mark something a gift, do I still have to declare it?
Yes, fully — gift is a declared category with its own value ceiling, not an exemption from declaring. Canada, the UK and Germany each publish a specific gift threshold and a specific set of conditions a shipment has to meet to qualify for it, and every one of them still requires the same accurate description and value on the form.
Does writing ‘gift’ on the form lower the duty automatically?
Only up to each country's own gift ceiling, and only if the shipment actually meets that country's conditions. Above the ceiling — CAD 60 in Canada, £39 in the UK, €45 in Germany — the excess is dutiable exactly like a purchase, and a shipment that does not meet the underlying conditions (sent between businesses, paid for by the recipient, arriving as a bulk order) does not qualify no matter what the label says.
What happens if the description or value turns out to be wrong?
The parcel is the one that pays for it. USPS's own guidance says a receiving country's customs officials may reject, return or destroy a package over customs form requirements that were not met, and every carrier holds a shipment at the border until its paperwork and its contents agree. None of that is a service SMKlog or any carrier performs on the sender's behalf — the form is the sender's own statement.