Fitting every package into a container and locking the doors does not mean the shipment has been packed safely. A clean container with uneven load distribution, a sound pallet that is not blocked or secured, or dry cargo packed in a humid environment may still shift, collapse, suffer condensation damage, endanger the person opening the doors, or be rejected for corrective action. This article maps the main errors from empty-container inspection and planning through load distribution, securing, moisture control, sealing and evidence retention.

Operational update: July 2026 | Scope: dry containers, with separate notes for reefer, dangerous goods and heavy cargo

QUICK FACTS

Errors begin before loading

Failure to inspect the floor, walls, doors, holes, odour, dryness, CSC plate and allowable mass can invalidate the entire plan.

Fitting is not the same as distributing

Mass must be controlled longitudinally, transversely and vertically; point loads and an offset centre of gravity create instability.

Tight stowage is not always securing

Blocking, bracing, dunnage and lashing must suit cargo mass, geometry, friction, force direction and securing-point capacity.

Moisture and compatibility are often missed

Damp timber, moisture-sensitive cargo, rain during packing, odour or leakage may cause mould, corrosion and cross-contamination.

Stuffing photos are evidence

Keep photos of the empty CTU, each loading layer, securing materials, the door zone, seal number and weighing/VGM records.

SCOPE OF APPLICATION

The article primarily applies to FCL cargo packed into dry freight containers. Different cargo groups require different priorities:

CARGO GROUP	TYPICAL RISK	PRIORITY CONTROL
Cartons and palletised consumer goods	Crushed cartons, stack collapse, pallet sliding and unsecured door-end voids	Stacking strength, stow plan, anti-slip measures and door-end restraint
Bagged goods, agricultural products and moisture-sensitive materials	Mould, condensation, torn bags and cargo flow	Cargo/packaging moisture, dry clean CTU, liners and an assessed moisture-control solution
Drums, jerricans and leak-prone cargo; dangerous goods where applicable	Leakage, rolling, sliding and incompatible substances	Orientation, pallets/trays, blocking, segregation, markings and IMDG where applicable
Machinery, coils and heavy packages	Point load, offset COG, floor damage and lashing failure	Package gross mass, COG, bearing area, bedding, blocking and lashing design
Reefer/perishables	Blocked airflow, loading above marks, wrong set point or unsuitable product temperature	Airflow plan, set point, ventilation, humidity, actual product temperature before stuffing and power

Limitation: dangerous goods, heavy coils, OOG, flexitanks, bulk and reefer cargo require additional specialist rules, carrier instructions and technical approval.

KEY TERMS

TERM	MEANING	OPERATIONAL ROLE
CTU – Cargo Transport Unit	A freight container, swap body or road vehicle used to carry cargo	The CTU Code covers planning, inspection, packing, securing and handover
Stuffing / Packing	Placing and arranging cargo inside a container	Includes positioning, load distribution, materials, final checks and closure
Dunnage	Materials used for separation, cushioning, void control or load spreading	Controls voids, increases friction and protects cargo
Blocking & Bracing	Structures that restrain cargo movement	Transfers forces from cargo to suitable load-bearing parts of the CTU
Lashing	Restraint using webbing, chains, wire or an approved system	Controls sliding, tipping and shifting
COG – Centre of Gravity	The balance point of a package or cargo block	A high or offset COG increases tipping and uneven-load risk
Point load / Bearing area	Concentrated load and the contact area transmitting it to the floor	Determines whether beams, spreader plates or specialist equipment are needed
Container sweat	Condensation on internal container surfaces	May drip onto cargo as temperature and humidity change

WHY PACKING ERRORS OCCUR

A container is exposed to vibration, braking, acceleration, cornering, lifting, tilting and transfers between truck, terminal and vessel. Cargo therefore experiences longitudinal, transverse and impact forces, not only gravity. Failures usually occur when the packing team optimises cubic utilisation but does not control five variables:

Suitable container

Correct type, sound floor–walls–doors, cleanliness, dryness, allowable mass and usable securing points.

Cargo and packaging

Package mass, dimensions, stacking strength, fragility, moisture, leakage potential and compatibility.

Load distribution

Total mass, longitudinal/transverse distribution, point load, COG and vehicle/road limits.

Movement restraint

Friction, voids, blocking, bracing, lashing and protection at the door end.

Handover evidence

Photos, stow plan, tally, weight/VGM, seal, responsible personnel and final inspection record.

The packer may be the last person to see the inside of the unit before it is opened at destination. A small packing error can therefore expose drivers, terminal workers, seafarers and consignees to risk.

MATRIX OF 12 COMMON MISTAKES

MISTAKE	CAUSE	POSSIBLE CONSEQUENCE	CONTROL
1. No empty-container inspection	Packing starts without checking floor, holes, doors, odour, water or infestation signs	Water ingress, contamination, packaging damage, door problems and equipment-condition disputes	Photograph all sides, floor, roof, doors, container number and CSC plate; check light-tightness, dryness, cleanliness and odour
2. Wrong container type	Selection based only on price or volume	Insufficient capacity, overload, airflow restriction or equipment change	Select by cargo characteristics, gross mass, dimensions, route and carrier requirements
3. No loading plan	Packages loaded in warehouse arrival order	Space shortage, rehandling, poor securing, uneven loading or unsafe door closure	Prepare a loading plan identifying heavy, fragile and priority-access cargo and the door restraint zone
4. Uneven weight distribution	Heavy cargo concentrated at one end/side or placed on weak packages	Instability, axle/floor overload, pallet tipping and stack collapse	Distribute longitudinally and transversely; keep heavy cargo low; check axle load, point load and COG
5. Payload or maximum gross mass exceeded	Estimated weights; pallets/dunnage omitted; plate not checked	Incorrect VGM, gate/load rejection, structural and road-limit risk	Reconcile package gross masses, tare, payload, CSC plate, local limits and VGM method
6. Unsuitable securing materials	Weak timber, unknown lashing capacity, damaged pallets, incorrect air-bag use or damp materials	Material failure, cargo movement, moisture and phytosanitary problems	Use fit-for-purpose materials; verify MSL/WLL where relevant; regulated raw-wood packaging and dunnage must be treated and marked in accordance with ISPM 15
7. Securing by intuition	Weak attachment points, poor angles, unprotected edges or too few restraints	Lashing failure, sliding/tipping and damage to walls or doors	Design for mass, friction, COG, force direction and securing-point capacity; use edge protection
8. Uncontrolled voids	Non-tight stowage without blocking/bracing; reliance on stretch wrap	Cargo accelerates through voids and impacts other cargo or doors	Control voids with suitable restraint and secure each cargo block, especially at the door end
9. Incompatible cargo packed together	Odour, moisture, dust, leakage, chemicals or DG compatibility not assessed	Cross-contamination, quality loss, hazardous reaction or carriage rejection	Use a compatibility matrix; separate wet, odorous and leaking cargo; apply IMDG segregation for DG
10. Moisture ignored	Packing in rain, damp pallets/timber or unsuitable cargo temperature	Mould, corrosion, label failure, softened cartons and condensation	Keep CTU and materials dry; record moisture where relevant; assess voyage, climate, packaging and desiccants
11. Reefer packing errors	T-floor blocked, cargo above load line, wrong set point/ventilation/humidity	Uneven temperature, restricted airflow and quality deterioration	Use a reefer stow plan; keep supply/return paths open; confirm set point, ventilation and humidity; cargo should be at carrying temperature before stuffing. Do not pre-cool an empty container outside a sealed cold-store loading interface
12. Poor sealing and records	Door gear not verified, seal placed incorrectly, or photos/VGM records missing	Security exposure, document mismatch and weak shortage/damage evidence	Engage all door cams; apply the designated uniquely numbered seal, using a high-security seal where the route or carrier requires it; photograph and reconcile the record

CONTROLS BY STAGE

STAGE	CHECK	EVIDENCE	OUTPUT
Before container arrival	Booking, container type, package count, dimensions, package gross mass, cargo characteristics and DG/temperature needs	Packing List, cargo data sheet, SDS/DGD if applicable, loading plan	Approved packing concept and materials
Empty-unit receipt	Container number, CSC plate, structure, floor, doors, cleanliness, dryness, odour, holes and securing points	Photos/video, EIR and exchange record if defective	CTU accepted as suitable
During stuffing	Loading sequence, weight zones, pallets, load spreading, blocking/bracing/lashing and voids	Layer/zone photos, heavy-cargo COG and securing images, material record	Stable cargo block matching the plan
Before door closure	Door zone, markings/placards, package count, loose materials and reefer load line	Final-face image, door-restraint image and tally sheet	Doors can close without cargo-fall risk
After closure	Door cams, lock, seal, gross mass/VGM, reefer settings and handover data	Seal/door images, weight/VGM, seal log and handover record	Ready for gate-in before cut-off

DOCUMENTS AND DATA

DOCUMENT / DATA	PREPARED BY	PURPOSE	FIELDS TO RECONCILE
Packing List	Shipper/factory	Confirms package count, gross/net mass, dimensions and marks	Packages, weights, marks & numbers and description
Heavy-package data sheet / drawing	Cargo owner/manufacturer	Provides COG, lift/lash points, bearing area and storage needs	Gross mass, outer dimensions, COG and lift/lash points
Stowage / Loading Plan	Operations team/packer	Defines package positions and load distribution	Package count, orientation, heavy zones, voids and door zone
SDS, DGD and DG data where applicable	Authorised consignor/shipper	Supports classification, packaging, marking, placarding, segregation and declaration	UN No., Proper Shipping Name, class, packing group and flash point where applicable
Container inspection record	Packer/warehouse	Evidence of CTU condition before packing	Container number, date/time, findings, photos and inspector
Securing material record	Packer/lashing contractor	Evidence of materials and installation	Type, specification, rated capacity where relevant and location
Tally sheet and stuffing photos	Warehouse/supervisor	Quantity control and process evidence	Package count, position, packaging condition and time
Seal record, weight ticket and VGM	Shipper/authorised party	Security and verified-mass submission	Container number, seal number, VGM, method and authorised person

EIGHT-STEP PACKING PROCESS

Lock cargo data

Confirm cargo type, package count, package gross mass, dimensions, packaging, hazards, moisture/temperature and route.

Select the CTU and prepare the plan

Check internal dimensions, allowable mass, securing points, truck limits and route restrictions; prepare a loading plan.

Inspect the empty unit

Check container number, CSC plate, structure, floor, doors, light-tightness, odour, dryness and cleanliness.

Prepare the area and materials

Use level ground, wheel restraint, lighting, suitable forklift/crane, PPE, pallets, dunnage and lashings.

Load and distribute mass

Keep heavy cargo low; control longitudinal/transverse distribution, point load, COG, stacking strength and access to securing points.

Block, brace and lash

Restrain movement in relevant directions; protect edges, doors and vulnerable surfaces; do not rely only on stretch wrap.

Final inspection

Count packages, inspect packaging, remove loose materials, check labels/placards, door zone and reefer airflow; take photos.

Close, seal and hand over

Engage all door gear, apply the designated seal, record the correct seal number, determine VGM and complete handover documentation.

RESPONSIBILITY MATRIX

PARTY	PRIMARY RESPONSIBILITY	DO NOT ASSUME
Consignor / cargo owner	Provides accurate cargo, packaging, mass, hazard and storage information	A Packing List does not transfer responsibility for data accuracy to the warehouse
Shipper under the contract of carriage	Ensures VGM and transport data are provided and coordinates carrier requirements	Delegating weighing or transmission does not automatically remove responsibility
Packer / stuffing warehouse	Inspects CTU, plans and executes packing/securing, closes/seals and keeps evidence	Carrier acceptance does not mean the internal method was fully audited
Lashing contractor / surveyor	Performs or verifies technical work within the agreed scope	A survey certificate cannot cure incorrect cargo data or materials differing from the plan
Haulier / driver	Positions the unit safely, complies with vehicle/road limits and receives seal handover	The driver cannot fully assess internal distribution after closure
Carrier / terminal	Publishes cut-offs and acceptance conditions and may inspect, reweigh or reject	Gate-in or booking confirmation is not unconditional approval of all internal details

RISKS AND CONSEQUENCES

RISK GROUP	EXAMPLE	IMPACT
Commercial damage	Crushed cartons, torn bags, machinery abrasion, corrosion and pallet collapse	Loss of value, rework, returns, insurance claims and supplier disputes
Personal safety	Cargo falls from doors, rolls or shifts; CTU becomes unstable	Injury to warehouse staff, drivers, terminal personnel, seafarers and consignees
Equipment and vehicles	Floor puncture, bulged walls, distorted doors and axle overload	Container repair charges, operational delays and repacking
Schedule	Gate rejection, hold, re-inspection, equipment exchange and missed sailing	Additional trucking, lifting, storage, DEM/DET and late delivery
Compliance	Incorrect VGM, undeclared DG, missing placards or non-compliant wood	Carriage rejection, remediation or regulatory action
Evidence and insurance	No pre-stuffing photos, seal record or consistent mass data	Difficulty proving when and why loss occurred; weaker claim file

TECHNICAL REFERENCES

SOURCE	BODY	ROLE	NOTE
IMO/ILO/UNECE CTU Code 2014	IMO, ILO and UNECE	Guidance on planning, CTU inspection, load distribution, packing, securing, closure and handover	Non-mandatory code of practice; combine with law, modal rules and carrier requirements
IMDG Code 2024 – Amendment 42-24	IMO	Mandatory international requirements for packaged dangerous goods by sea	Mandatory from 1 January 2026; also check national rules and carrier requirements
SOLAS VGM	IMO / SOLAS chapter VI	Requires the shipper to provide verified gross mass before vessel loading	VGM does not replace load-distribution and securing controls
Container packing guidance	Hapag-Lloyd and carriers	Equipment data, load distribution and acceptance conditions	Check the current version and route/booking conditions
Reefer cargo handling	Reefer carriers	Airflow, set point, ventilation, humidity and load line	Cargo should be at carrying temperature before stuffing; do not pre-cool an empty unit outside a sealed cold-store interface
ISPM 15	IPPC / FAO	Treatment and marking of regulated raw-wood packaging, including dunnage	Processed wood such as plywood is treated differently; check importing-country requirements

CTU CODE – IMO CTU CODE – UNECE SUPPLY-CHAIN RESPONSIBILITIES CONTAINER PACKING GUIDE IMDG CODE – IMO REEFER HANDLING ISPM 15 – IPPC

FAQ

1. Does a valid CSC plate remove the need for a pre-packing inspection?

No. The CSC plate addresses structural safety at equipment level, while the packer must still check cleanliness, dryness, odour, floor, walls, doors, holes and suitability for the particular cargo.

2. Does tightly packed cargo still need securing?

It may. Tight stowage works only where packages are strong enough, voids are controlled and the block can withstand transport forces. Stretch wrap does not automatically secure a pallet to the container.

3. Is placing heavy cargo in the centre always correct?

Not always. Longitudinal/transverse distribution, COG, point load, vehicle axles and floor limits must be assessed. Very heavy packages may require engineered bedding or load spreaders.

4. Do desiccants solve every condensation risk?

No. Effectiveness depends on moisture in cargo and packaging, voyage duration, temperature variation, packaging and CTU tightness. First minimise moisture entering the unit.

5. Does carrier gate-in transfer packing responsibility?

Not automatically. A carrier or terminal may inspect, reweigh or reject, but gate-in does not mean every internal packing and securing detail has been audited.

6. Can reefer cargo be packed as tightly as dry cargo?

Not by applying dry-container logic. Reefer loading must preserve supply and return airflow, load-line limits and commodity-specific ventilation. Cargo should be at carrying temperature before stuffing; an empty reefer should not be pre-cooled outside a sealed cold-store loading interface.

7. Which stuffing photos should be retained?

At minimum: empty unit, container number/CSC plate, each layer or zone, dunnage and securing, door area before closure, closed doors and seal number. Heavy cargo should include bedding, COG and securing points.

APPLICATION NOTE: Packing must be designed for the cargo, packaging, package masses, CTU, transport modes, route, climate, dangerous-goods rules and carrier/terminal requirements. The CTU Code is a key practice reference but does not replace legal duties, the contract of carriage, DG/OOG/reefer approval or engineering calculations for heavy cargo. This English version is for operational reference and is not an official legal translation.

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