Shipping by sea and shipping by air are usually treated as two versions of the same process, with the only difference being speed and cost. That assumption causes damage rates that the shipper cannot explain, because the two modes expose packaging to very different conditions.
The first difference is humidity. A container crossing an ocean spends weeks in an environment where humidity can be extremely high, and where condensation can form on the inside of the container as temperatures fluctuate between day and night. Paper packaging absorbs that moisture, softens, and loses strength. Packaging that performed adequately in a dry test may fail in a humid container, and the failure appears as crushing or collapse rather than impact damage.
The second difference is transit time. A sea shipment spends weeks in transit, compared to days for air. Over that period, the package experiences continuous vibration, temperature cycles, and the gradual settling of contents. Materials that recover after impact and maintain their structure are more reliable over long transit than materials that degrade under sustained stress.
The third difference is stacking. Containers are loaded to maximize space, which means packages are stacked under significant weight for the duration of the journey. The packaging at the bottom of the stack carries the load of everything above it, and if the packaging collapses under that load, the products above crush the products below. Packaging for sea freight needs to resist sustained compression, not just impact.
The fourth difference is handling. Sea freight involves more handling points than air freight, because the container passes through terminals, cranes, and trucks before it reaches the destination. Each of those handling points is an opportunity for the package to be dropped or dropped onto, and the cumulative effect over a longer journey is higher than for air.
The fifth difference is the risk of water damage. Container leaks, condensation drips, and exposure during loading and unloading can all introduce water. Paper packaging that is not protected against moisture loses strength when wet, which is why sea freight packaging often needs a moisture barrier or a desiccant.
Aircosan's kraft honeycomb paper roll performs well in sea freight conditions when specified appropriately. It is made from virgin kraft paper pressed into a 3D honeycomb structure, and it is zero-plastic, 100% recyclable, and biodegradable, with FSC certification. It comes in 70g and 80g, widths of 300mm, 380mm, and 500mm, and roll lengths from 20m to 250m, with an expansion ratio of 1:7 and an average tensile strength of 13.86N. For sea freight, the heavier 80g grade provides more margin for the sustained compression and longer transit, and the material's elasticity means it recovers between handling events rather than staying compressed. Each roll carries a batch number engraved inside for traceability. Paired with the electric honeycomb paper dispenser, it expands and cuts automatically at up to 25m/min, runs on 110V or 220V, handles both honeycomb paper and liner paper, and comes in an H30 standard model and an H30 cutter model with foot control available.
The honest limitation is that paper is susceptible to moisture, and no paper packaging is immune to a container that takes on water. For sea freight, the material should be used as part of a system that includes a moisture barrier or desiccant where appropriate, rather than as a standalone solution. Suppliers who understand the mode can advise on the right configuration.
The practical takeaway is to specify packaging for the transport mode, not for the product alone. Most businesses use the same packaging for sea and air, which is why the sea shipments produce damage that the air shipments do not. Operations that specify differently for each mode find that the sea freight damage rate falls without any change to the product, because the packaging was finally matched to the conditions it actually faces.