Buyer guide

Shower Head Packaging, Carton Specifications and Container Planning

Container planning is arithmetic once three numbers are fixed: units per master carton, carton dimensions and carton gross weight. From those you get cubic metres per carton, cartons per container and the loaded weight. ZHONGHE confirms the carton specification per model in the quotation, and the planning maths below works with any factory's numbers.

ZHONGHE — shower head factory, Cixi, NingboUpdated 2026-09-03

By Steven, Export Manager at ZHONGHE 10 years in shower head OEM/ODM export

Key facts
Item	Detail
CBM formula	Length x width x height in metres gives cubic metres per carton; multiply by carton count for the shipment
20 ft container	Commonly planned at about 33 CBM usable; confirm the figure with your forwarder for the lane and equipment
40 ft container	Commonly planned at about 67 CBM usable
40 ft high cube	Commonly planned at about 76 CBM usable, the extra volume coming from roughly one foot of internal height
What fills first	Shower heads are volume goods, so a container cubes out long before it reaches a payload limit
Pallets versus floor loading	Pallets consume height and leave floor gaps, commonly costing 10 to 15 percent of usable volume against floor loading
Carton specification	Units per inner and master carton, carton dimensions and gross weight, confirmed per model in the quotation
Marking	EAN-13 or UPC-A on the unit box, shipping marks on the master carton, both approved from a printed proof

Four Packaging Formats and What They Cost in Volume

Packaging format is a freight decision as much as a marketing one. The same shower head can ship in a colour box built for shelf presence, a brown box built for a courier network, a blister card built for a pegboard, or a bulk carton for an importer who repacks downstream. The product is identical and the cubic metres per unit are not.

The numeric columns below are deliberately unfilled. Unit box dimensions and units per master carton are model and packaging specific, and they are confirmed against the dieline in the quotation. What is general is the arithmetic you run once those numbers exist.

Packaging format	Unit pack	Unit box dimensions	Units per master carton	Volume behaviour
Retail colour box	Printed box with an insert or a bag inside	Model specific, fixed by the dieline	Confirmed with the carton specification	The most volume per unit, because the box is sized for shelf presence rather than density
E-commerce brown box	Plain or lightly printed kraft box	Model specific, fixed by the dieline	Confirmed with the carton specification	Slightly denser than a colour box, and often shipped onward as its own transport unit
Blister or clamshell	Product on a printed card under a formed shell	Model specific, fixed by the card size	Confirmed with the carton specification	The worst volume per unit: the card sets the footprint and the hang hole adds height
Bulk	Poly bagged units with dividers and minimal unit packaging	Model specific	Confirmed with the carton specification	The densest and cheapest to ship; the importer carries the repacking cost instead

Computing CBM

Cubic metres, written CBM, is the unit sea freight is planned and often priced in. One carton's CBM is its length times width times height in metres, using outside dimensions. A shipment's CBM is the carton CBM times the carton count. The arithmetic fails only when someone measures in centimetres and forgets to divide by a million.

Two derived numbers do the real work. Volume per unit is carton CBM divided by units per carton, which lets you compare packaging formats honestly. Cartons per container is usable container volume divided by carton CBM, rounded down.

Weight is the second constraint and rarely the binding one. Compute gross weight per carton as unit weight times units per carton plus packaging, then multiply by the carton count. For shower products the result sits well under the payload limit, which means volume is what you optimise and better internal protection usually costs nothing in freight.

Container Capacities, Pallets and Floor Loading

Usable volume is always below the geometric internal volume of a container, once stowage, gaps, door clearance and carton shape are counted. The figures below are the planning numbers commonly used in this trade, and they should be confirmed with your forwarder for the lane and equipment actually booked.

Pallets are the other volume decision. Floor loading fits more cartons because it uses the full height and leaves no gaps between footprints, at the cost of slower handling. Palletised cargo loses roughly 10 to 15 percent of usable volume and buys back speed and a lower damage rate. Many retail distribution centres simply require pallets, in which case the pallet size, commonly 1200 x 1000 mm or 1200 x 800 mm, belongs in the RFQ.

Container	Commonly planned usable volume	Payload guide	Notes
20 ft standard	About 33 CBM	Commonly around 21 to 22 tonnes	Cubes out long before it weighs out with shower products
40 ft standard	About 67 CBM	Commonly around 26 to 28 tonnes	Roughly twice the volume for less than twice the freight on most lanes
40 ft high cube	About 76 CBM	Commonly around 26 to 28 tonnes	About one foot more internal height, which is where the extra volume comes from
LCL, part container	Charged on the greater of CBM or tonnes	Not applicable	Sensible below roughly 12 to 15 CBM; above that a 20 ft usually wins on cost per unit

A Worked Example With Example Numbers

Every number in the table below is an illustration chosen to make the arithmetic readable. None is a ZHONGHE carton specification and none should be used for a booking. Replace them with the confirmed carton specification for your model before quoting freight.

The conclusion is the part worth keeping. On these example figures a 20 ft container fills on volume at under four tonnes of cargo, which is the normal pattern here. Packaging format, not product weight, is the freight lever.

Step	Example calculation	Result
Carton dimensions	0.52 m x 0.36 m x 0.42 m	0.0786 CBM per carton
Units per master carton	24 units	24
Volume per unit	0.0786 divided by 24	About 0.0033 CBM per unit
Order quantity	3,000 units divided by 24 per carton	125 cartons
Shipment volume	125 cartons x 0.0786 CBM	About 9.8 CBM, which is an LCL shipment
Cartons in a 20 ft	33 CBM divided by 0.0786 CBM	About 419 cartons, or about 10,000 units
Gross weight per carton	24 units at 0.35 kg, plus 0.9 kg of packaging	About 9.3 kg
Loaded weight of a full 20 ft	419 cartons x 9.3 kg	About 3.9 tonnes, far below the payload limit

Labels and Carton Marks

Marking is where planning meets the receiving warehouse. A carton that cannot be identified without opening it, or a barcode that will not scan, stops the goods moving as surely as a quality defect does. Agree the marks at RFQ stage and approve them from a printed proof.

Unit box: brand artwork, model, colour, and an EAN-13 or UPC-A barcode with its quiet zone and enough contrast to scan reliably.
Master carton main mark: buyer name, purchase order number, model, quantity, carton number as x of y, and country of origin.
Master carton side mark: net weight, gross weight, carton dimensions and any handling symbols the lane requires.
Batch or date coding: decide whether it goes on the unit box, the master carton or both, before anything is printed.
Pallet marking: a pallet identification label where the warehouse scans pallets, and ISPM 15 marking if wooden pallets are used.
Approve a printed proof of every printed surface, and scan a printed barcode rather than the artwork file.

FAQ

Questions on this topic

Short, factual answers so sourcing teams and AI search tools can quote them directly.

How do I calculate CBM for a shipment?

Multiply carton length, width and height in metres for CBM per carton, then multiply by the carton count. A 0.52 by 0.36 by 0.42 metre carton is 0.0786 CBM, so 125 of them are about 9.8 CBM. Use outside dimensions from the factory's carton specification.

How many shower heads fit in a 40 ft container?

It depends entirely on the carton specification, so compute it rather than assume it. Divide about 67 CBM of usable volume by your carton CBM, round down, and multiply by units per carton. On the example figures here that is roughly 850 cartons, or about 20,000 units.

Should I ship palletised or floor loaded?

Floor loading fits more cartons and costs more handling time; pallets cost roughly 10 to 15 percent of usable volume and save time and damage. If the receiving distribution centre requires pallets the decision is made, and the pallet size belongs in the RFQ so cartons can be sized to the footprint.

Is a 40 ft high cube worth the extra cost?

For volume goods, usually yes. A high cube is commonly planned at about 76 CBM against about 67 CBM for a standard 40 ft, roughly 13 percent more volume for a small freight difference on most lanes. Shower products cube out rather than weigh out, so the extra height converts into units.

When does LCL make sense instead of a full container?

Commonly below roughly 12 to 15 CBM, though the crossover moves with the lane and season. LCL is charged on the greater of volume or weight and adds consolidation handling at both ends, so compare landed cost per unit rather than the freight quotation.

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