Flatly refused
Hoverboards and gyroboards are named outright, alongside ammunition, firearms and their components, weapons, radioactive material, infectious substances, and narcotic or psychotropic substances.
Travel, to Japan
Shipping luggage to Japan
A boxed suitcase clears the ceiling Japan sets for its own Priority Mail International product at both ends of the tape measure: well under the 66 lb weight cap and comfortably inside 108 inches of length plus girth. That is not true of everything this site covers going to the same country — a ski bag misses the length line by more than a foot — which makes a suitcase one of the few bulky items worth mailing straight there instead of routing through a forwarder. Figures below are read from USPS's individual country listing for Japan on 2026-08-18.
Japan listing, read todayClears without a forwarderProhibited items named
Size decides it, not distance
Japan's postal ceiling is generous by international standards. Whether a bag clears it comes down to inches, not the miles between here and Tokyo.
The size math, worked against Japan's own line
USPS measures length plus girth as the longest side added to twice each of the other two, and Japan's Priority Mail International listing sets that total at 108 inches with a 66 lb scale ceiling on top, read on 2026-08-18. A carry-on and a large checked case both land inside it, with the checked case leaving the smaller margin of the two.
| Box | Longest side | Length plus girth | Against Japan's 108 in / 66 lb line |
|---|---|---|---|
| Carry-on, boxed about 22 × 14 × 9 in | 22 in | 68 in | Clear by 40 in |
| Large checked case, boxed about 32 × 22 × 14 in | 32 in | 104 in | Clear by 4 in |
A golf travel case measured against this same country's listing on this site's international golf guide runs two inches over that 108 inch line, and a full-length ski bag misses it by more than a foot. A suitcase is the shape that happens to fit, not a rule that luggage in general does.
What Japan won't take, and what needs a different service
The Japan listing's prohibited list is short next to some destinations, but two lines matter more than the rest for anyone packing a suitcase rather than a box of goods, per the listing read 2026-08-18.
Jewelry and cash need the right product
Coins, currency, precious metals and jewelry are admissible only as a registered First-Class Package International Service item or an insured Priority Mail International parcel. Packed loose in an ordinary suitcase box, they are not admissible at all.
Replica goods, refused broadly
The listing refuses anything infringing a patent, trademark, design or copyright, worded broadly enough to catch replica apparel and unlicensed merchandise packed alongside clothing.
None of this is unique to SMKlog's own rules; it is the same country listing that decides whether Japan Post will hand the box to a delivery driver at all. A watch or a ring packed inside a suitcase without the registered or insured service on the label is the detail most likely to catch a traveler by surprise here.
Two things worth doing before the tape goes on
Box it, don't bag-tag it
Wheels, handles and zipper pulls catch on sorting equipment the way a taped carton does not. Put the case inside an outer box with padding on every side rather than shipping the bag itself.
Write a value you can defend
Japan Customs assesses duty off the figure written on the customs form, not off what a person opening the box later decides it was worth. A low-balled declaration invites a hold; an inflated one invites a bigger duty bill than the contents warrant.
Pull anything with a loose cell
A spare battery or a power bank packed alongside clothing follows its own lithium-battery rule rather than the ordinary parcel path. Keep it out of a checked-luggage box and route it separately.
What SMKlog prices, and what it doesn't
Priority Mail International is a USPS retail product, bought at a post office counter or through USPS's own online postage tools, so this page reads the rule rather than selling the label. What SMKlog's own checkout prices is a domestic US parcel — useful for the leg from a home to a shipping point, or for a suitcase headed somewhere inside the country instead of overseas. The general customs and duty picture for the destination, including how Japan Post collects what is owed at the door, is covered on this site's broader guide to shipping a package to Japan, linked below.
Where these numbers come from
- USPS, Individual Country Listing for Japan — the 66 lb weight ceiling, the 60 inch length and 108 inch length-plus-girth limits, the prohibited items list, and the valuables and replica-goods rules. Read 2026-08-18.
USPS revises country listings without notice. Treat the figures above as one dated reading and check the listing itself before packing anything the rule would refuse.
Common questions
Can a suitcase be mailed straight to Japan?
Yes, size-wise. Japan's Priority Mail International listing caps a parcel at 66 lb and 108 inches of length plus girth combined, and a boxed suitcase sits well inside both numbers even at the large end. That is not true of longer sporting gear on the same country listing, which is why a suitcase does not need the forwarder routing that a ski bag or a golf travel case does.
What is the actual size ceiling for a package to Japan?
60 inches on the longest side, 108 inches for length plus girth combined, and 66 lb on the scale, per the USPS individual country listing for Japan read on 2026-08-18. A 32 by 22 by 14 inch checked case works out to 104 inches of length plus girth, four inches under the line.
What can't go inside a suitcase headed to Japan?
The listing names hoverboards and gyroboards outright, alongside firearms, ammunition, weapons, radioactive material and narcotic or psychotropic substances. Separately, jewelry, cash, coins and precious metals are only admissible as a registered First-Class Package International Service item or an insured Priority Mail International parcel; on any other service they are refused rather than merely restricted.
Does a mailed suitcase need a customs form for Japan?
Yes, on every Priority Mail International parcel regardless of what is inside. Japan Customs works from the value written on that form, so an honest declaration of what the contents are actually worth is what keeps the parcel moving instead of sitting for a manual review.
Should the suitcase go in its own box?
Yes. A bare case with wheels and a handle does not survive a parcel network the way a boxed one does, and a carrier treats an unboxed bag as its own container rather than something it protects. Wrap or box it before it ships anywhere, domestic or international.