Sea and land transport from a packaging perspective. Differences in the costs of protective measures
The cost of packaging is not a fixed figure – it depends on the transport environment through which the cargo passes. The same item, when packaged for road transport and for sea freight, may differ in packaging costs by as much as several times, even though the product itself remains unchanged.
This difference is determined by four variables: moisture, dynamic loads, transit time and international standards – IPPC, SOLAS and IMO/ILO recommendations. Each of these generates specific, quantifiable cost items for the packaging manufacturer. In practice, this means that the decision on the packaging method should be made before the mode of transport is chosen, not afterwards – because it is the route profile, rather than the product itself, that determines how much we will pay for securing the load.
1. Why does the transport environment determine the cost of packaging?
1.1 Load profile in road transport
Road transport is characterised by short, repetitive loads – acceleration, braking and vibrations transmitted from the road surface to the trailer. The duration of the load’s exposure is generally short, usually between 1 and 5 days. The risk of corrosion is low, as the load does not have time to come into contact with moisture to an extent that would actually damage the metal. The main risk remains improper securing of the load on the trailer – the load shifting during emergency braking or manoeuvres.
1.2 Load profile in maritime transport
Sea freight involves a completely different level of risk. Transit times are usually between 2 and 6 weeks, and the relative humidity inside the container can reach 90–100 per cent. This gives rise to a phenomenon known as ‘container rain’ – the condensation of water vapour on the steel ceiling of the container when its temperature falls below the dew point of the air trapped inside. The droplets fall directly onto the cargo, causing corrosion, mould and discolouration. Added to this are lateral tilts and longitudinal rocking in heavy swell, as well as cumulative dynamic overloads during every transhipment at the terminal – cranes and forklift trucks generate additional lifting cycles that are completely unknown in road transport.
1.3 Implications for packaging design
Road transport requires, above all, protection against movement and mechanical impact. Sea transport requires the same, plus an additional barrier against moisture and corrosion, as well as a structure capable of withstanding repeated handling by cranes. This is a fundamental difference in cost, not just in terms of construction – every additional layer of protection is a separate item in the cost calculation.
2. The structure of security costs in road transport
2.1 Packaging design
Road transport is dominated by crates made of planks, plywood or OSB, standard or non-standard pallets, and wooden platforms and racks. The strength requirements are lower than for sea freight, which allows for thinner timber sections and simpler structural joints.
2.2 Securing the load inside the vehicle
To stabilise the load on a semi-trailer, tension straps, anti-slip mats, securing wedges and – for less sensitive goods – stretch film are used. These methods are considerably cheaper than the barrier solutions used in maritime transport, as they do not need to protect against prolonged exposure to moisture.
2.3 Typical cost items
| Cost item | Product / service | Approximate contribution towards the cost of postage |
| Packaging design | A crate made of planks, plywood or OSB, a pallet | 40–55 per cent |
| Production workforce | Preparation and assembly of packaging | 20–25 per cent |
| Securing the load | Belts, anti-slip mats, wedges | 10–15 per cent |
| Preparation time | Usually 1–2 working days | a time-based item, not a direct cost item |
| Additional safeguards | Stretch film, protective corner protectors | 5–10 per cent |
3. The structure of security costs in maritime transport
3.1 Damp-proof and anti-corrosion barrier
The key cost component of export packaging for sea freight is VCI (Volatile Corrosion Inhibitor) film – a material saturated with volatile corrosion inhibitors, which evaporate inside an airtight package and settle on the metal surface, forming a monomolecular protective layer that blocks the reaction between oxygen, moisture and the metal. In practice, it is used in conjunction with vacuum packaging, and for particularly sensitive components – such as integrated circuits or electrical cabinets – VCI anti-corrosion capsules and moisture absorbers are added. A further level of protection is provided by ALU barrier film, which, when combined with VCI, ensures airtight protection for up to 24 months and safeguards against temperature fluctuations and contamination.
3.2 Reinforced box construction
A sea freight crate must be able to withstand repeated handling by cranes, which is why thicker timber sections and additional corner reinforcements are used. The design is tailored to the specific weight profile and centre of gravity of the load – this is a key difference compared to road transport packaging, where standardised dimensions are sufficient in most cases. Further details on the principles of structural selection are set out in the article on wooden transport crates.
3.3 Stowage and securing inside the container
Stowage is the process of arranging and securing cargo inside a container in accordance with maritime safety regulations. It requires IPPC-certified dunnage timber, Cordstrap-type woven straps, as well as dunnage bags and anti-slip mats. The industry standard dimensions for stowage timber are 100x100x2500 mm, 35x100x2500 mm and 20x100x2500 mm.
The rules for stowage are based on the document ‘CARGO STOWAGE IN SEA TRANSPORT’ in accordance with Res. A.714(17), Annex 13, Code of Safe Practice, as well as on IMO/ILO recommendations and the requirements of the SOLAS Convention. This is not a mere formality – in accordance with these regulations, a container that is not correctly stowed should not be accepted on board the vessel, and if it is not properly secured, it may be rejected as early as the loading stage. The result is a delay in shipment, an additional inspection and – if the container exceeds the free laytime in port – a demurrage charge, which in Europe can amount to around 450 USD for 14 days’ demurrage, and in some ports can reach as much as several hundred dollars per day per container.
3.4 Loading inspection as a cost item
Many exporters commission an independent loading survey to be carried out by a licensed surveyor – in Poland, this is often a company such as SGS Polska. This involves checking the technical condition of the container prior to loading and supervising that stowage is carried out correctly, in accordance with the following standards: Res. A.714(17), Annex 13, Code of Safe Practice, IMO/ILO and SOLAS. The cost of such an inspection should be treated as an insurance policy – it represents an expense amounting to a fraction of a per cent of the cargo’s value, designed to prevent significantly higher costs arising from claims, delays or the rejection of the container at the terminal.
3.5 Typical cost items
| Cost item | Product / service | Approximate contribution towards the cost of postage |
| Reinforced construction | A box with thicker walls and corner stiffeners | 30–40 per cent |
| Anti-corrosion barrier | VCI film, aluminium foil, VCI capsules, desiccants | 15–25 per cent |
| Container stowage | IPPC-certified dunnage timber, Cordstrap straps, dunnage bags | 15–20 per cent |
| Stevedoring labour | Arrangement and securing of the load within the container | 10–15 per cent |
| Loading inspection | Audit of the condition of the container and its securing (e.g. SGS Poland) | 5–10 per cent |
A comparison of the tables in Sections 2 and 3 clearly shows that, in maritime transport, the proportion accounted for by the structure itself is falling in percentage terms in favour of new items which do not generate any road transport costs at all – anti-corrosion treatment, stowage and inspection. It is these items, not the container itself, that account for the majority of the cost difference.
4. The IPPC certificate as a common ground for both communities
The IPPC certificate, confirming that timber complies with the international phytosanitary standard ISPM 15, applies to wooden packaging used in both transport contexts – but its cost and administrative implications differ in each case. In land transport within the European Union, an IPPC certificate is usually not required, as phytosanitary regulations governing intra-EU trade do not cover wooden packaging to the same extent as they do for intercontinental exports. In maritime transport outside the EU, an IPPC certificate is a prerequisite for the cargo to be cleared for shipment.
The absence of such a certificate for sea exports carries consequences that are disproportionate to the cost of obtaining it – the container being detained at the phytosanitary border, the costs of quarantining the timber, and, in extreme cases, the return of the entire consignment to the consignor at the consignor’s expense. IPPC-certified packaging manufacturers, such as Danpol, confirm that every batch of timber complies with this standard – details are available on the Danpol certificates page.
5. Comparative study: the same load, two environments
Let us consider a control cabinet or a hydraulic system shipped once by road to a customer in the EU and once by sea to a customer outside Europe. The basic design – a box tailored to the dimensions – is similar in cost in both cases. The difference only becomes apparent at subsequent stages.
For road transport, all that is required is a box with a reinforced base, securing the load with straps inside the semi-trailer and – for components sensitive to atmospheric moisture during a short stop – optional stretch film. Preparation usually takes 1–2 days.
For the maritime variant, the following are included: vacuum packaging with ZERUST/EXCOR VCI film, additional anti-corrosion capsules and moisture absorbers inside the cabinet, ALU barrier film on the exterior of the component, a reinforced crate design for crane handling, stowage inside the container using IPPC-certified timber and Cordstrap straps, and, at the customer’s request, a loading inspection. The preparation time increases in proportion to the number of protection stages. This approach is described in detail in relation to the packaging of control cabinets and crates for hydraulic systems, where the sensitivity of the components to moisture and vibration requires the individual selection of protective barriers.
In practice, insuring the same piece of equipment for sea freight is usually 60–120 per cent more expensive than for road transport to the EU – the difference increases with the length of the sea route and the susceptibility of electronic components to corrosion. It is precisely this range that means the cost of packaging must be calculated separately for each shipping destination, rather than averaged.
6. How to optimise the cost of securing the load without compromising its safety
6.1 Selecting a barrier method appropriate to the actual risk
Not every sea freight consignment requires a full VCI plus ALU barrier. For shorter sea journeys or less sensitive mechanical components, 230-micron-thick heat-shrink film is often sufficient, working well on both flat-rack containers and open road trailers. Selecting a method based on the actual risk profile – rather than automatically applying the highest level of protection – is one of the most effective ways to reduce costs without compromising safety.
6.2 Wood drying as a risk-mitigating investment
A rigorous timber-drying process, exceeding the requirements of the IPPC standard, directly enhances the crate’s resistance to moisture and pests during long sea voyages. This is a one-off cost incurred during the production of the packaging, which reduces the risk of costly damage during a voyage lasting several weeks. The mechanism and parameters of this process are described in an article on methods of drying timber for transport crates.
6.3 Design consultation prior to route selection
Analysing the load’s parameters – weight, centre of gravity, and sensitivity to moisture and vibration – before the packaging is produced, rather than during production, helps to avoid excessive protection and the associated costs. A packaging manufacturer who knows the route and transport conditions in advance can select exactly the right level of protection required for that particular route – no more, no less. The scope of such services includes bespoke transport crates and comprehensive export packaging.
FAQ
Does sea freight always require more expensive packaging than road freight?
Not always – it depends on the transit time and the cargo’s susceptibility to moisture. In most cases, however, an additional anti-corrosion barrier and stowage significantly increase the cost of securing the cargo.
Is VCI film a legal requirement, or is it a manufacturer’s choice?
VCI film is not a legal requirement – it is a technical decision made by the packaging manufacturer, based on a corrosion risk analysis for the specific load and route.
What role does the loading inspection play in the total cost?
It is a preventative cost designed to avoid significantly higher costs arising from claims, delays or the rejection of a container at the terminal in the event of stowage that does not comply with standards.
Does IPPC certification increase the price of packaging?
It increases the cost of materials and the production process only slightly, but the absence of such certification for sea exports carries the risk of costs many times higher should the consignment be detained at the phytosanitary border.
Summary
The cost of securing a load is a function of the risks posed by the transport environment, not simply the cost of the packaging material itself. Land transport favours simplicity and speed of preparation – the short exposure time does not require an elaborate protective barrier. Sea transport prioritises barrier performance, structural strength and compliance with international standards – IPPC, SOLAS, IMO/ILO recommendations – because weeks spent in a damp container and repeated crane handling leave no room for underestimation.
The advice is simple: it is worth consulting the packaging manufacturer Danpol before finalising the transport route, to avoid both underestimating the risks and overpaying for excessive protection. Please do get in touch for a quote on packaging tailored to your specific transport route.
