Real Reasons Cargo Gets Damaged in Transit — And How to Prevent It

When a shipment arrives damaged, the first instinct is to blame the carrier. That instinct is usually wrong — and acting on it is usually expensive.

The majority of cargo damage in international freight originates before a carrier makes a single crane lift. It starts in a packing shed, on a factory floor, or at the moment someone chooses the wrong carton weight rating for an 8,000-kilometre sea voyage. Carriers have legal defences for exactly this scenario — the “insufficient packing” exclusion is one of the most commonly invoked clauses in cargo insurance, and one of the most commonly overlooked by shippers until a claim is denied.

This guide covers the real mechanisms behind transit damage: what actually happens to cargo between origin and destination, where the risk concentrates, what the legal and insurance consequences are, and what you can do to reduce the probability of a loss before you seal the container.

The Journey Your Cargo Actually Takes

Most shippers think of their cargo’s journey as: factory → ship → warehouse. The real journey looks more like this:

• Factory — packed and palleted
• Truck — road transport to freight forwarder or CFS
• CFS or container yard — loaded into container
• Port of origin — container craned onto vessel
• Vessel hold — 3–6 weeks at sea through changing temperatures and swells
• Port of transshipment (often 1–2 stops) — container craned off, held in yard, craned back on
• Destination port — craned off vessel, moved through customs examination
• Truck — road transport to warehouse
• Warehouse — unloaded

Each step is a separate risk event. Each crane lift puts the container through a shock load. Each temperature change creates a condensation risk. Each transshipment adds another handling cycle to a box that was designed, at best, for one.

The mental model matters because damage prevention requires knowing which step is the weakest link. That varies by cargo type, route, and packing quality — but the transshipment point and the original packaging decision account for the majority of damage events across the industry, according to TT Club loss prevention data.

The Packaging Gap: Where Most Damage Originates

The most reliable finding in cargo damage analysis is that packaging failure is the primary cause across all cargo types. The TT Club, one of the world’s largest specialist transport and logistics insurers, has consistently found that inadequate packing and securing of cargo is the single largest contributing factor to cargo claims.

The failures are not exotic. They are routine:

• Wrong carton weight rating. A carton rated for stacking 3 high is loaded 6 high. The bottom cartons compress and distort, and the cargo inside is damaged by the weight of the column above it.
• Insufficient internal blocking and bracing. Goods shift inside the carton during road transport. By the time the container is craned onto a vessel, the internal structure has already collapsed.
• Pallet overhang. Cartons extend beyond the pallet edge and are sheared by the forklift tines or by the container wall during loading.
• Failure to account for the full journey. Packaging that passes domestic transport testing may not survive the road-to-sea-to-road vibration profile of an international freight movement.

The insurance consequence is direct. Most standard cargo insurance policies, including the widely used Institute Cargo Clauses (A), exclude damage caused by “insufficient packing or preparation.” If your packaging does not meet the standard expected for the journey, the insurer will decline the claim. This exclusion is not a technicality — it is the single most common reason cargo claims fail.

The benchmark for “sufficient packing” in international freight is the CTU Code (Code of Practice for Packing of Cargo Transport Units), published jointly by the IMO, ILO, and UNECE. It is not legally mandatory in most jurisdictions, but it defines what the industry regards as best practice. When a carrier or insurer assesses whether packaging was adequate, the CTU Code is the reference point.

Container Sweat: The Hidden Moisture Mechanism

Moisture damage is commonly misunderstood. Shippers assume it means rain, flooding, or a leaking container roof. In the majority of moisture damage cases, the water does not come from outside the container at all.

Container sweat is condensation that forms on cargo surfaces when the warm, humid air sealed inside a container cools as the vessel moves through cooler water. The physics are straightforward: warm air holds more moisture than cool air. When the air temperature drops below the dew point, that moisture condenses on the nearest cold surface — which is usually the cargo itself, not the container walls.

Several factors make this worse:

• Wooden pallets and packaging materials. Timber absorbs and releases moisture. A container loaded with wet timber packing will release moisture into the closed environment continuously.
• Route temperature variation. A container loaded in subtropical Southeast Asia and transshipped through a temperate northern port will experience significant temperature cycling.
• High-moisture cargo. Agricultural products, green coffee, and natural fibre goods loaded at elevated moisture content are a known source of cargo sweat events.

Prevention requires addressing the moisture source, not the symptom. The practical steps: load in a dry environment, use silica gel desiccant packets sized correctly for the container volume (most suppliers give gram-per-cubic-metre guidance), wrap moisture-sensitive goods in polybags or VCI film before cartoning, and — for steel and metal goods — specify VCI (Vapour Corrosion Inhibitor) packaging explicitly in your purchase order.

Transshipment: Where the Damage Spike Occurs

If you were to plot damage probability across a container’s journey, the curve would not be smooth. It would spike at transshipment ports.

Every crane lift puts a container through a dynamic load. A correctly packed container handles this well. A container with internal shifting cargo, overweight stacks, or poor weight distribution handles it badly — and the internal failure that was developing through the road journey is completed by the crane event.

The major transshipment hubs on routes relevant to Australia-Thailand freight — Singapore, Port Klang, Colombo, Dubai — handle millions of TEU per year. The speed of operations at scale means that individual container handling is not gentle. This is not a failure of those ports; it is simply the physics of high-volume automated operations.

The practical implication: fewer transshipments equals lower damage probability. A direct sailing between origin and destination ports eliminates the transshipment crane events entirely. On routes where direct sailings exist and where cargo value or fragility is high, the additional freight cost of a direct routing often pays for itself in reduced damage and insurance claims.

For shipments to Thailand specifically — where freight costs already carry multiple port charge components — the transshipment decision is worth making explicitly, not by default.

Stowage Position Inside the Container

Where your cargo sits inside the container affects the damage it experiences. The CTU Code addresses stowage pattern and weight distribution in detail, but the practical principles are:

• Heaviest cargo on the floor, lightest on top. This sounds obvious, but mixed-product container loads frequently violate it when loading is done without a stow plan.
• Weight distributed across the floor, not concentrated on one side. An off-centre load creates a listing container during lifting, which puts lateral stress on internal stacking.
• Fragile cargo away from the doors. The doors are the most vulnerable point of a container to external impact. If the container is rear-ended during road transport, door-adjacent cargo takes the full force.
• Void filling. Unfilled voids allow cargo to shift. Airbags, dunnage bags, and kraft paper void fill are standard tools. An unfilled void is not just a damage risk — it signals insufficient packing to any insurer or carrier who inspects the container after an incident.

A stow plan — even a simple hand-drawn diagram created before loading — is evidence that the packing was deliberate. It matters in claims and it matters for the loading crew.

Vibration and Shock: The Journey Your Electronics Don’t Expect

Road transport generates a specific vibration frequency profile. Sea transport generates a different one. The combination of road-sea-road, repeated at each transshipment, creates a vibration and shock history that standard factory testing often does not replicate.

Electronics are particularly vulnerable because printed circuit boards, solder joints, and connectors have resonance frequencies. If the packaging allows the product to vibrate at its own resonance frequency during transport, fatigue damage accumulates — damage that may not manifest as visible breakage but shows up as field failures after delivery.

Glass is vulnerable to shock at transshipment — crane lifts generate the highest instantaneous shock load of any stage of the journey.

The mitigation for high-value electronics and fragile goods: shock and vibration indicators on the outer packaging (these are inexpensive labels that change colour if the package has been dropped or subjected to excessive vibration), and packaging designed to isolate the product from the transport medium — foam-in-place, custom moulded EPE foam, or suspension packaging — rather than simply surrounding it with soft fill.

The Claims Process: Two Moments That Determine Everything

When damage does occur, the outcome of any claim depends heavily on what happens in the first hours after delivery — not in the weeks of correspondence that follow.

Moment 1: The delivery receipt. When the carrier delivers and presents the consignee with a delivery receipt or proof of delivery, this is the moment to note any visible damage. “Clean” delivery — signing without noting damage — is treated by carriers and courts in most jurisdictions as confirmation that the cargo was delivered in good order. A carrier who has a clean signed receipt has a very strong legal position. Note damage specifically: not “possible damage” but “dented carton, top right corner, cargo not inspected” — and note it before you sign.

Moment 2: The 3-day notification window. For concealed damage — damage that was not visible at delivery but discovered when the carton was opened — most insurance policies and the Hague-Visby Rules require written notification to the carrier within 3 days of delivery. Late notification is one of the most common reasons damage claims fail. The clock starts at delivery, not at the moment you discover the damage.

Photograph everything. Photograph the container seal number. Photograph the container doors before opening. Photograph the cargo in position before unloading. Photograph the damage. This documentation is not for your files — it is evidence.

On the insurance side: liability under the Hague-Visby Rules (which governs most international sea freight) is capped at SDR 2 per kilogram or SDR 666.67 per package — amounts that are typically far below the commercial value of the cargo. This is why marine cargo insurance that covers the full commercial value of the shipment is not optional for any business shipping goods of material value. See our guide to shipping cost components for where insurance fits in the cost stack.

For shipments into Thailand specifically, understanding what gets held at customs versus what gets physically damaged in transit are two different risk categories — both worth understanding. Our guide on why shipments get stuck at Thai customs covers the customs dimension.

Prevention Checklist Before You Seal the Container

Damage prevention is almost entirely a pre-loading activity. Once the container is sealed, the options narrow to route selection and insurance coverage. Before sealing:

1. Verify carton weight ratings. Confirm that outer cartons are rated for the stack height you are using. Carton compression testing (BCT) should match the actual stacking load.
2. Specify internal blocking and bracing. Include internal bracing requirements in purchase orders, not just outer carton specifications. Inspect before sealing if possible.
3. Check pallet overhang. No cargo should extend beyond the pallet edge. If it does, use a larger pallet or redistribute.
4. Install desiccant. Size to the container volume and the cargo type. Silica gel at 1–2 kg per 10 CBM is a common starting point for general cargo; increase for hygroscopic goods.
5. Seal moisture-sensitive goods. Polybags, VCI film for metals, moisture barrier bags for electronics.
6. Create a stow plan. Heavy items on the floor, fragile items away from the doors, voids filled.
7. Photograph before sealing. Document the loaded container interior before the doors close. This is your baseline evidence.
8. Note the container seal number. Photograph the seal. Note the number on your shipping records.
9. Review your insurance coverage. Confirm that your policy covers the full commercial value of this shipment, and review the packing-related exclusions before the container leaves.
10. Brief the consignee. The person signing the delivery receipt needs to know what to do — note visible damage before signing, notify within 3 days of concealed damage discovery, photograph everything.

For businesses shipping household goods or personal effects to Thailand — where the cargo mix is particularly varied and packing is often done under time pressure — the same principles apply. Our household goods shipping guide covers packing requirements in that context.

What Cargo Insurance Actually Covers (and What It Doesn’t)

Institute Cargo Clauses (A) — the broadest standard form — covers “all risks” of physical loss or damage from an external cause. The key exclusions that cargo owners most often encounter:

• Insufficient packing or preparation. As discussed above. If the packing is below the standard expected for the journey, the claim is excluded.
• Inherent vice. Damage caused by the natural properties of the cargo — fresh fruit ripening, metal corroding in the presence of moisture, wet hides decomposing. This is not insurable under any standard policy because the loss was not caused by an external event; it was caused by the cargo’s own nature.
• Delay. ICC (A) does not cover losses caused by delay, even if the delay was caused by an insured event. The exception is where delay causes consequential loss to perishable cargo.
• War and strikes. Covered by separate ICC (War) and ICC (Strikes) clauses, which are typically available as add-ons.

The International Union of Marine Insurance (IUMI) publishes annual ocean cargo statistics. The data consistently shows that packing-related and handling-related losses account for a significant portion of cargo claims globally — losses that are, in most cases, preventable.

Frequently Asked Questions

Who is liable when cargo is damaged in transit?

Liability depends on the transport document and applicable convention. Under sea freight (Hague-Visby Rules), the carrier’s liability is capped at SDR 2 per kilogram or SDR 666.67 per package — often far below the cargo’s commercial value. Carriers can also invoke the “insufficient packing” defence, making the shipper responsible. Marine cargo insurance covering the full commercial value is the only reliable protection.

What is container sweat and how do I prevent it?

Container sweat is condensation that forms on cargo surfaces when humid air inside a sealed container cools as the vessel moves through cooler waters. The moisture does not come from rain — it comes from moisture trapped in air and packaging materials at the time of loading. Prevention: load in a dry environment, use correctly sized desiccant packets, wrap moisture-sensitive goods in polybags or VCI film, and avoid loading high-moisture goods alongside dry goods.

Does cargo insurance cover damage from poor packaging?

Most standard cargo insurance policies — including Institute Cargo Clauses (A) — exclude damage caused by “insufficient packing or preparation.” If the insurer determines that the packaging was inadequate for the journey, the claim will be declined. This is the most common reason cargo damage claims fail.

How do I file a cargo damage claim?

Two steps are critical. First: note the damage on the delivery receipt before signing it. A clean signature releases the carrier from liability in most jurisdictions. Second: notify your insurer and the carrier in writing within 3 days of delivery for concealed damage. Late notification is one of the most common reasons claims fail. Photograph the damage before unloading if possible.

What is the CTU Code and does it apply to my shipment?

The CTU Code (Code of Practice for Packing of Cargo Transport Units) is published jointly by the IMO, ILO, and UNECE. It is not legally mandatory in most jurisdictions, but it defines the industry standard for “sufficient packing.” When a carrier or insurer assesses whether packaging was adequate, the CTU Code is the benchmark they use.

---

Cargo damage is largely preventable — but prevention happens before the container is sealed, not after it arrives. If you’re shipping goods to Thailand or anywhere in Southeast Asia and want a pre-shipment packing review, transit route assessment, or cargo insurance coordination, speak with the Swift Cargo team. We can advise on container packing standards, routing decisions, and insurance coverage before a loss occurs — not after.