A carton with no marks is a carton nobody can route. Shipping marks exist so that a person who does not read your language, has no access to your paperwork and is moving several hundred boxes an hour can put yours in the right place.
What goes on the main panel
The conventional set, and what each element is for:
- Consignee name or a buyer's mark — identifies whose goods these are at the destination warehouse.
- Destination port or city — routing at transhipment.
- Order or contract number — ties the carton back to paperwork.
- Carton number in the form 1/200, 2/200 — this is the element that lets anyone see immediately whether the shipment is complete.
- Gross and net weight, and dimensions — needed for handling equipment selection and for freight verification.
- Country of origin — a customs requirement in most markets.
Marks should be on at least two adjacent faces. A carton stacked against a wall with marks on the hidden face is functionally unmarked.
Handling symbols, and the ones that are ignored
Standard pictograms — umbrella for keep dry, glass for fragile, arrows for this way up — are widely understood and cost nothing to print.
It is worth being realistic about their effect. "Fragile" changes little in a container yard. If a product genuinely cannot survive being dropped or inverted, the answer is internal packaging that tolerates it, not a symbol asking people not to. Symbols are most useful for things that are non-obvious: a battery mark, a temperature limit, a stacking limit.
Stacking limits are the exception worth taking seriously. A carton marked with a maximum stack height and a corresponding compression rating gives the warehouse something actionable, and it is the marking most likely to prevent crushed goods.
Regulatory marks that are not optional
Several markings are legal requirements rather than conventions, and getting them wrong holds shipments at the border:
- Country of origin, in the required wording for the destination market.
- Dangerous goods marks where applicable — lithium batteries being the case that catches out the most buyers, since a product containing a battery may be regulated even when the battery is small.
- Wood packaging treatment marks where pallets or crates are wooden. Untreated wood packaging is refused at many borders, and the mark has to be on the wood itself, not on a label.
- Recycling and material marks where the destination market requires them.
The wood packaging point is worth a specific check. A shipment can be perfect in every other respect and be held because the pallet under it lacks a treatment stamp.
Carton specification
The box is a structural component and gets specified as one:
Board grade and flute. Single wall suits light goods; double wall is normal for anything heavy or for long sea journeys. The relevant figure is the compression strength, which determines how high the cartons can be stacked without crushing the bottom layer.
Humidity. Corrugated board loses a large share of its compression strength at high humidity — figures around 50% loss are commonly cited for tropical conditions. A carton specified against bench-dry strength will not perform in a container crossing the tropics, and this is the single most common cause of collapsed stacks on arrival.
Carton size against the pallet. Cartons that do not tile neatly onto the pallet footprint waste space and leave overhanging edges that crush. Working the carton dimensions backwards from the pallet is worth doing before the box is ordered.
Sealing. Tape width and pattern matter for heavy cartons; an H-pattern seal holds where a single centre strip does not.
Common errors worth checking before production
- Marks printed only on one face.
- Carton numbering omitted, making it impossible to detect a missing box until the whole shipment is counted.
- Weight printed as net where the warehouse expects gross, or the reverse.
- Barcodes printed too small or over a corrugation, so they will not scan.
- Marks printed in ink that smears when the carton gets damp.
All five are found by inspecting one finished, marked carton before the run is printed — which is the cheapest quality control step in the whole export process.