Shipping Mark Guide for Knit Bag Cartons: Main Mark, Side Mark, Character Height and the Cost of Getting One Wrong

What a Wrong Shipping Mark Costs

A wrong shipping mark costs about USD 2 to USD 5 per carton to re-label at a distribution centre, or about USD 80 to USD 150 per day in demurrage if the container is held, against a cost of roughly USD 0.02 to USD 0.35 per carton to apply it correctly at origin.

That ratio is the reason the mark deserves more attention than it usually gets. A 40ft container of knitted bags carries roughly 400 to 610 cartons. Re-labelling 500 cartons at USD 3 each is USD 1,500, and it assumes the destination has the people and the labels to do it, which in peak season it may not. A container held for five days awaiting a corrected mark costs about USD 500 in demurrage and misses the delivery window, which for a seasonal knit programme can mean it misses the season. Both are avoidable for under USD 200 at origin.

The cost that is hardest to quantify and easiest to avoid is the wrong-consignee error. A mark carrying a distribution centre code that is one digit wrong sends the container to the wrong building, and the correction is a domestic re-delivery plus a delay measured in days. This is the one check on the list that no amount of money at the destination fixes quickly.

The Two-Part Mark: Main Mark and Side Mark

A shipping mark has two parts with two different readers: the main mark identifies the shipment for a person at a dock, and the side mark gives the count and weight for someone reconciling a delivery.

The split matters because the two parts are read at different moments and usually by different people. The main mark is read when the container is opened, standing up, from about two metres. The side mark is read when the cartons are being counted into racking, often from a handheld terminal, often in a hurry. Putting the count on the main mark and the consignee on the side mark inverts the reading order and slows both.

Character Height and Reading Distance

Shipping mark characters should be at least 12 mm tall, which is the height at which a person with normal vision reads the mark from about three metres in warehouse lighting, and the consignee line should be larger than the rest.

Twelve millimetres is a floor, not a target. The consignee name and the distribution centre code are the two lines a dock worker actually uses, and those are commonly set at 20 mm to 25 mm so they can be read from the container door before any carton is lifted. The remaining lines can sit at 12 mm. What should not happen is compressing all lines to the same 8 mm size to fit more text on the panel, because the panel then carries more information and is read less often, which is strictly worse than a shorter panel that gets used.

Contrast is the other half of legibility and is where pre-printed cartons beat stencils. Black ink on natural kraft reads well at 12 mm; the same ink on a heavily printed or a dark-coloured carton does not, and a mark stencilled over a printed brand panel on a retail-ready carton is close to unreadable. Where the carton carries retail print, the shipping mark needs a clear reserve area of unprinted board, and that reserve has to be designed into the artwork rather than found afterwards.

Minimum character height

12 mm for the standard lines of the mark

Consignee and DC code

20 mm to 25 mm, readable from the container door

Handling symbol height

At least 100 mm for a stack-limit symbol, smaller for the rest

Mark position

Two adjacent side faces, offset at least 50 mm from the base

Logistic label offset

At least 50 mm from the base and from any vertical edge

Ink

Black or dark blue on natural kraft; reserve unprinted board where the carton is printed

Carton number format

n of N, for example 37 of 610

Weight format

Kilograms to one decimal, net and gross shown separately

Pictorial Handling Symbols and When They Are Binding

Pictorial handling marks are standardised under ISO 780, which sets the symbols for this way up, keep dry, fragile and stack limit, and they are worth using because they survive a language barrier that a printed instruction does not.

The stack-limit symbol is the one that earns its place on a knit carton. It consists of a stack of bars with a numeral indicating the maximum number of identical cartons that may be stacked on the one bearing the mark, and it is the only symbol that carries a variable the loader has to read. On a knit programme the number is set by the compression result rather than by the carton's own strength: a board that survives six layers dry may only survive four after a humid voyage, so the symbol number is set from the tested figure with the humidity allowance taken out.

The other symbols are advisory rather than binding, and it is worth knowing which is which. This way up and keep dry are instructions to handlers and are widely honoured. A fragile symbol on a carton of knitted bags is nearly always wrong: knit absorbs impact well and the carton is not fragile, so the symbol adds a handling expectation the goods do not need and can slow a distribution centre that treats marked cartons differently.

Three Ways to Apply the Mark and What Each Costs

Three methods apply a shipping mark to a knit bag carton: stencilling at about USD 0.02 per carton, a printed label at about USD 0.06, and pre-printing the carton at about USD 0.35, and the choice follows run length and how much the mark varies between cartons.

The cost comparison reverses once a container is mixed. A stencil that has to be re-cut for each style and colourway adds labour that quickly exceeds USD 0.06 per carton, so above about three styles in one container the printed label wins even though its unit price is three times higher. The break-even is not a fixed number; it is the number of times the stencil has to change.

The Side Mark: Carton Number, Weight and Dimensions

The side mark carries five numbers — quantity, carton number of total, net weight, gross weight and dimensions — and the one that is most often wrong is the carton number of total, because the total is not known until packing finishes.

That sequencing problem has a clean solution and a tempting bad one. The clean solution is to apply the sequence number at packing, after the total is known, using a stamp or a label. The tempting bad one is to print a nominal total from the load plan and hope packing matches it, which produces containers where the last carton is numbered 610 of 604. A receiver scanning sequences will flag that immediately, and the container is held until it is explained.

Weight and dimensions on the side mark are not decoration either. Gross weight feeds the customs entry and the stowage plan, and on a knit container it is small enough that an error has no safety consequence but does have a documentation one: an entry declaring 4,800 kg against a packing list showing 5,100 kg is a discrepancy that gets queried. Dimensions feed the load plan, and the dimension that has to be stated is the one measured on the packed carton, which is a few millimetres larger than the flat carton because a filled knit carton bulges slightly at the panel centres.

Mixed Containers: One Mark Per Style and Colourway

A mixed container needs a distinct mark per style and colourway, because a receiver sorting 600 look-alike cartons uses the mark as the only sorting key, and a mark that covers two colourways makes half the container unsortable without opening cartons.

• One style and colourway code per carton, never two codes on one mark.
• A colourway code that matches the code on the purchase order exactly, including any leading zeros.
• A carton sequence that runs continuously across the whole container, not restarting per style.
• Part cartons at each colourway change carrying the code of the majority contents and their true piece count.
• A separate SSCC-18 for every carton, including the part cartons.
• The packing list showing one line per carton so the mark can be reconciled against it.

How the Mark Is Checked and Corrected

The mark is checked twice: on the first 20 cartons off the packing line, and again inside the AQL 2.5 inspection (ISO 2859-1) that covers the finished lot before release.

The first-twenty check is where errors are caught, because a mark error is systematic rather than random: if the distribution centre code is wrong, it is wrong on every carton from the same stencil or the same print file, and twenty cartons is enough to find it. The measurable faults are a character height under 12 mm, a mark placed where a pallet band will cover it, a sequence number that does not run continuously, and a weight that does not match the scale.

A Shipping Mark Spec Buyers Can Send Once

A shipping mark spec that gets applied correctly first time states the method, the placement, the character height, the exact panel text and how the variable data is applied, and it states them as a spec rather than as a sample photo.

• Application method: stencil, label or pre-printed carton.
• Placement: which faces, and the offset in mm from the base and from vertical edges.
• Character height in mm for the consignee line and for the remaining lines.
• The exact text for each line, supplied as text rather than as an image.
• How the carton sequence and the SSCC are applied, and at what point in packing.
• Handling symbols required, including the numeral on the stack-limit symbol.
• Whether the panel needs a reserve area because the carton carries retail print.

Supplying the panel as text rather than as a photo is the line that prevents the most rework. A photo of a previous shipment's mark has to be re-typed, and re-typing a distribution centre code or a purchase order number is where the digit errors come from.

Where the Mark Sits in the Delivery Schedule

Mark artwork is approved inside the 7-working-day sampling window along with the carton specification, and the variable data is applied during packing inside the 30-day bulk production window once the carton count is final.

The sequencing is what protects the despatch date. Fixing the fixed part of the mark early means only the sequence and the total are left to apply at packing, which takes minutes rather than days and does not hold the container. A programme that waits for the total before designing the panel at all is the one that ends up stencilling in a hurry at the container. Shipments leave FOB Xiamen, with CIF and DDP available.

Frequently Asked Questions

People Also Ask

The Mark Costs Cents at Origin and Dollars Anywhere Else

Every correction to a shipping mark gets more expensive the further the container travels. At origin it is a re-stencil costing cents; at a distribution centre it is a few dollars a carton; at a held container it is a daily charge plus a missed window.

Settle the fixed part of the mark with the sample and leave only the sequence to packing. For the carton the mark goes on, see carton specification for bag shipping. For the documents carrying the same numbers, see export documentation for bag shipments.