Shippers Own Containers

What Is a Shipper’s Own Container?

A shipper’s own container is an intermodal freight container supplied by the cargo-owning business, exporter, importer, freight forwarder or another party outside the ocean carrier’s equipment fleet. The shipping line transports the SOC but does not normally own it.

By contrast, a carrier-owned container, or COC, belongs to or is leased by the shipping line. The carrier releases it to the shipper for packing and expects the empty container to be returned within the agreed free time.

When Does Using an SOC Make Commercial Sense?

An SOC often works best when the destination lacks a convenient empty-container return depot or when the consignee needs the container for an extended period. Project cargo, construction materials, engineering equipment, aid supplies and shipments to mines, energy sites or remote industrial locations frequently fall into this category.

Ownership can also suit regular exporters that want consistent equipment specifications. A shipper may choose containers with particular door arrangements, internal fittings, ventilation, height, or security features rather than accepting whichever carrier unit is available.

Potential advantages

• Greater control over container availability, condition and specification.
• Reduced exposure to carrier detention charges for holding the carrier’s equipment beyond its free time.
• Freedom to retain the container at the destination for storage, subject to local planning, customs and land-use requirements.
• More predictable equipment for repeat shipments or specialist loading operations.
• Potential savings on remote or one-way routes where returning an empty carrier container would prove difficult.

Costs and limitations

• The owner funds the purchase, inspections, maintenance, repairs, and repositioning.
• Some shipping lines apply SOC handling charges or different freight rates.
• The carrier may refuse a container that does not meet its operational, identification or documentation requirements.
• Port storage, terminal handling, haulage and customs charges can still apply even though carrier equipment detention does not.
• A container suitable for static storage may not meet the requirements for international transport under load.

CSC Plates and the Owner’s Safety Responsibilities

The International Convention for Safe Containers 1972, known as CSC 1972, establishes internationally recognised safety requirements for most freight containers used in international surface transport. The International Maritime Organisation states that approved containers receive a Safety Approval Plate containing relevant technical information. It also makes the container owner responsible for subsequent maintenance and periodic examination. See the IMO’s official CSC Convention overview.

A CSC plate should not be treated as a blanket guarantee that a container remains fit for shipment. The plate records the container’s approval and technical limits, while the examination scheme and the unit’s current physical condition determine whether the unit remains safe to operate. Serious corrosion, cracked welds, damaged corner castings, distorted structural rails, defective doors or an unsafe floor may still prevent acceptance.

Under the CSC examination framework, a new container’s first examination must take place no later than five years after manufacture. Subsequent examinations must occur at intervals of no more than 30 months. Owners may use either a Periodic Examination Scheme, usually identified by a next examination date, or an Approved Continuous Examination Programme identified by an ACEP marking. The IMO confirms these examination intervals and programme options in its official container safety guidance.

In Great Britain, the Health and Safety Executive explains that both ACEP and PES examinations must assess safety and suitability. Its guidance lists corrosion, welding, fastening, mechanical damage, structural components, and CSC plate validity as matters a competent examiner should inspect. See the HSE freight container safety guidance.

Verified Gross Mass for an SOC

Using your own container does not remove the Verified Gross Mass requirement. Under SOLAS regulation VI/2, the shipper named on the bill of lading, sea waybill or equivalent transport document remains responsible for obtaining and communicating the VGM of the packed container.

The IMO states that the VGM must be provided to the vessel master or their representative and the terminal representative early enough to prepare the ship’s stowage plan. A packed container without an available VGM must not be loaded unless the required mass is obtained through an agreed contingency arrangement. See the IMO’s official VGM guidance.

Practical VGM controls

1. Confirm which legal entity will appear as the shipper on the transport document.
2. Agree the carrier’s VGM cut-off, submission channel and required format before packing.
3. Record the SOC’s correct tare mass rather than relying on a generic figure for the container type.
4. Include pallets, dunnage, securing materials and every cargo item when using Method 2.
5. Use calibrated equipment or an approved certified method as required by SOLAS.
6. Ensure an authorised person signs or authenticates the VGM submission.
7. Keep weighing records and confirmation that the carrier or terminal received the VGM.

BIFA’s guidance on its Standard Trading Conditions highlights the customer’s responsibility for accurate cargo particulars, including verified gross mass, and for ensuring customer-supplied transport equipment is fit for purpose. See BIFA’s Know Your Trading Conditions guide.

UK Customs Procedures for Shipper-Owned Containers

The cargo and the container require separate consideration. Owning the container does not alter the need to classify, value and declare the goods carried inside it. The importer may need a GB EORI number, suitable customs software or an appointed customs agent before making an import declaration. GOV.UK confirms that businesses importing into England, Scotland or Wales generally need an EORI number beginning with GB. See the official UK import clearance process.

Temporary Admission and the container itself

HMRC states that freight containers entering the UK carrying goods are subject to Temporary Admission rules. Temporary Admission may allow qualifying goods or equipment to enter without immediate Customs Duty or import VAT where the conditions are met, and the items will be re-exported. In most cases, GOV. The UK states that Temporary Admission can permit goods to remain for up to 24 months, although the applicable period and conditions depend on the goods and the procedure used.

Reusable packaging requires a customs declaration. GOV.UK explains that eligible reusable packaging may, at suitable locations and in qualifying circumstances, be declared orally or by conduct. It may also be declared for Temporary Admission where it is intended for re-export. Businesses should confirm whether the particular SOC movement meets the definition and conditions rather than assuming every container automatically qualifies. See the HMRC reusable packaging guidance.

Where the container is being sold, permanently imported or retained in the UK rather than re-exported, a different customs and tax treatment may apply. The purchase contract, invoice, ownership transfer, intended use and customs value should therefore make the commercial position clear.

Safety and security declarations

An Entry Summary Declaration, commonly called an ENS, is separate from the main import declaration. It supplies advance safety and security data to the border authority. GOV.UK requires the declaration to be accurate and complete and identifies affected shipments using information such as container and transport document numbers.

BIFA’s industry guidance notes that, from 31 January 2025, goods imported from the EU into Great Britain generally require an ENS unless a specific waiver applies. See the GOV.UK ENS guidance and BIFA’s Safety and Security FAQs.

Export declarations

The exporter or appointed representative must obtain customs clearance before goods leave the UK. Submission deadlines depend on the route and mode. GOV.UK states that containerised sea cargo moving to certain listed nearby destinations must generally be declared at least two hours before departure, while other containerised sea cargo must generally be declared at least 24 hours before loading onto the vessel. Always check the current route-specific requirement before dispatch. See the official full export declaration guidance.

Buying an SOC for International Shipping

Start by telling the supplier that the container will carry cargo for international shipment. A unit sold for static storage may be wind and watertight but still lack a suitable CSC examination status, acceptable identification or the structural condition required by the shipping line.

Ask for clear photographs of the CSC plate, examination markings, container number, corner castings, roof, understructure, doors and floor. Where the shipment carries heavy, concentrated or unusual loads, obtain professional packing and engineering advice rather than relying solely on the container’s nominal payload.

Before paying for haulage to the port, send the container details to the freight forwarder or shipping line. Confirm acceptance, documentation, terminal restrictions, VGM cut-off, seal requirements and any SOC surcharge in writing. A rejected container at the quay can create storage, lifting, transport and rebooking costs that quickly outweigh the original saving.

Official Compliance Resources

• International Maritime Organisation: International Convention for Safe Containers
• International Maritime Organisation: Verification of the Gross Mass of a Packed Container
• Health and Safety Executive: Freight Container Safety
• GOV.UK: Get UK Customs Clearance When Importing Goods
• GOV.UK: Declaring Reusable Packaging for Great Britain Imports and Exports
• GOV.UK: Making an Entry Summary Declaration
• BIFA: Know Your Trading Conditions

Regulations, carrier procedures and customs systems change. Check the current official guidance and obtain advice from your freight forwarder, customs representative or competent container examiner before arranging a live shipment.