Complete Buying Guide: How to Choose a Used 20-Foot Dry Shipping Container

Why the Used 20-Foot Dry Container Remains the Benchmark

The used 20-foot Dry shipping container is the most universal unit in logistics. Standardized, robust, stackable, and available everywhere, it serves a dual purpose: long-term storage on a site and shipping goods by sea, road, or rail. Its affordable price — from EUR 1,350.00 for a revised, watertight unit — makes it a credible alternative to a prefabricated building, warehouse, or long-term rental.

But "used" does not mean "random." Between a simply watertight container and one fit for export, between a unit located in a nearby depot and one 600 km away, the difference in quality and total cost can be significant. This guide reviews everything you need to know before buying: actual specifications, condition, watertightness, CSC certification, transport, installation, regulations, and maintenance.

What You Are Actually Buying: Anatomy of a 20-Foot Dry

A 20-foot Dry container (also called "standard" or "dry") is a rectangular steel box, without refrigeration or mechanical ventilation, designed for dry goods. It complies with ISO 668, which sets the external dimensions and maximum masses for series 1. This standardization is essential: it guarantees that your container can be handled, stacked, and transported by any equipment or container ship.

Dimensions and Volume

• Nominal external dimensions: approximately 6.058 m long, 2.438 m wide, and 2.591 m high.
• Typical internal dimensions: approximately 5.898 m long, 2.352 m wide, and 2.393 m high.
• Internal volume: approximately 33 m³, equivalent to 11 European pallets on the floor (10 to 11 depending on stowage).
• Floor area: approximately 13.8 m² usable.

These values are indicative: depending on the manufacturer and equipment, a few centimeters or tens of kilograms may vary. The nameplates affixed to the door or side panel indicate the exact data for the specific unit.

Masses: Tare, Payload, and MGW

• Empty weight (tare): generally between 2,200 and 2,400 kg.
• Maximum payload: approximately 28,000 kg for a standard 20-foot.
• Maximum gross weight (MGW): commonly around 30,480 kg.

These figures are crucial for transport: a loaded 20-foot container can easily reach 30 tonnes, requiring a suitable container truck and compliance with road weight limits.

Materials and Construction

The structure relies on a steel frame and wall panels made of Corten steel. This low-alloy steel develops a protective rust layer on the surface that slows corrosion, even when exposed to sea spray. The side walls and roof are corrugated to increase rigidity. The floor is 28 mm marine plywood, laid on metal cross members: it resists moisture and supports rolling loads and pallets. The rear doors are double metal doors with rubber seals and locking bars. At the eight corners, the corner castings allow slinging, lashing, and stacking.

Used, One-Trip, Cargo Worthy: Decoding Market Conditions

The used market classifies containers by condition, and this classification directly impacts price and possible use.

• One-trip: new container used for a single voyage. Recent paint, new seals, near-new appearance. Highest price.
• Cargo worthy: fit for international sea transport, with valid CSC certificate. Structural and watertight condition meets carrier requirements.
• Wind & Watertight (WWT): wind and watertight, perfect for static storage. This is the quality level of the unit offered here.
• As is: sold as is, without watertightness guarantee. Reserved for uses where water is not an issue (e.g., storing rubble).

A WWT container effectively protects against normal weather, but it is not airtight like a new one. It may show superficial rust, dents, or scratches without affecting use. For static storage out of sight, these flaws are often acceptable; for regular export or a polished brand image, a one-trip or cargo worthy will be preferable.

The 7 Checkpoints Before Buying

A used container should be bought with eyes open. Here is the checklist to apply, on-site or remotely via photos and video.

1. Watertightness (WWT): check the condition of door seals, absence of holes or cracks in walls and roof, floor flatness, and lock operation. A simple test: close the doors and see if daylight passes through the gaps.
2. Perforating rust: inspect the roof and lower walls first, the most exposed areas. Surface rust can be treated; perforation compromises watertightness.
3. The floor: look for soft spots, splinters, signs of moisture or mold. A sound floor should be rigid and dry.
4. The doors: open and close both leaves. Locks should slide without force, seals should be flexible and not cracked.
5. The structure: check for major deformation, weld condition, and flatness of top and bottom rails.
6. The CSC certificate: if exporting, require its presence and check its validity date. Without a valid CSC, the shipping line may refuse loading.
7. Location: a container available in a nearby depot greatly reduces transport costs. This is an often-underestimated total cost criterion.

A WWT container sold for EUR 1,350 in Marseille can cost EUR 400 to 800 more once delivered 500 km away. Always compare the delivered price on site, not just the ex-depot price.

Which Use for Which Condition?

The choice of condition directly depends on the intended use. For static storage (materials, archives, furniture, seasonal equipment), a used WWT container is sufficient in the vast majority of cases. For export use, a cargo worthy container with valid CSC is required, otherwise the shipping line may refuse loading. For conversion into an office, changing room, or break room, aesthetic condition matters more and insulation, electricity, and ventilation must be planned. For a modular housing or commercial premises project, the work is heavier and local planning rules apply.

20-Foot, 40-Foot, High Cube: How to Choose the Size

The 20-foot is not always the right answer. The table below compares the most common formats to help you decide.

• 10-foot: volume of about 15 to 16 m³. Handy when floor space is limited. Price per m³ often higher than 20-foot, but easier to move.
• 20-foot: about 33 m³, tare 2.2 to 2.4 t, payload ~28 t. The best compromise of versatility, price, and handling ease.
• 40-foot: about 67 m³, tare often 3.7 to 4 t, payload ~26 to 28 t. Better price per m³, but wider access and suitable equipment required.
• 40-foot High Cube: about 76 m³ thanks to ~30 cm extra internal height. Ideal for tall loads, mezzanines, or modular housing.
• 20-foot High Cube: exists but rarer on the used market.

Simple rule: if you store a lot of volume but little weight, the 40-foot is more economical per m³. If you need to move the container regularly, or if site access is constrained, the 20-foot remains unbeatable.

Dry, Reefer, Open Top, Flat Rack: Is Dry Always the Right Type?

The container type matters as much as the size.

• Standard Dry: dry goods not sensitive to temperature. The most versatile and economical.
• Reefer (refrigerated): equipped with a refrigeration unit, for temperature-controlled products (food, pharmaceutical, flowers). Significantly higher cost and maintenance.
• Open Top: open or tarpaulin roof, for loading tall or bulky goods from above by crane.
• Flat Rack: without side walls or roof, for heavy or wide loads (machinery, equipment, pipes).
• Tank: a tank mounted in a container frame, for liquids.

For standard storage or shipping dry goods, the dry remains the most rational choice.

Price, Transport, and Total Cost: What the Listed Price Hides

The price of EUR 1,350.00 corresponds to a used 20-foot Dry container in correct condition, watertight, without aesthetic guarantee. This amount does not necessarily include transport to your site or handling fees (lifting, positioning). To assess the real cost, add up:

• The container price.
• Road transport from the depot to your site (varies with distance and access).
• On-site handling (crane truck, forklift, reach stacker).
• Any ground preparation work (slab, compacted gravel, blocks).
• Fittings if you convert the container (insulation, electricity, ventilation, locksmithing).

Transport Hosni Conteneur, based in Marseille, benefits from proximity to ports and regional depots, which can facilitate supply and reduce lead times. Always request a delivered-on-site quote to compare offers on equal terms.

Regulations: What to Know Before Installing or Shipping

Road Transport

The shipping container is considered goods or a vehicle depending on use. The total weight of the container and its load must not exceed vehicle and road regulation limits (GVW, GTW). For a standard road train in international transport, the limit is generally 44 tonnes, with possible exemptions. Beyond dimension or weight thresholds, an exceptional transport permit with prior authorization is required.

CSC Certificate and Inspections

The CSC Convention (Convention for Safe Containers) requires periodic inspections, generally every 30 months for containers in service. The certificate attests that the container is fit for international transport. Check its presence and validity date if you plan to ship.

Planning and Installation

For installation on a site, inquire with the town hall or planning department. Depending on use and duration, a prior declaration of works or a building permit may be required, especially if the container is used as a building. If the container receives people (office, housing), safety and health standards apply: insulation, ventilation, compliant electrical installations (NF C 15-100 for domestic installations).

Import and Customs

If you import a container from abroad, customs formalities may apply. Inquire with a freight forwarder or customs.

Installation: Preparing the Ground for Durability

A poorly placed container deforms, rusts faster, and its doors close poorly. A few simple rules:

• Stable, flat ground: concrete or compacted gravel. Avoid loose soil that makes the container sink.
• Ground insulation: place the container on blocks or cross members to limit corrosion from below and rising moisture.
• Flatness: a slight slope can hinder door opening. On sloped ground, plan shims or blocks.
• Anchoring: recommended in windy areas to resist wind.
• Access: plan maneuvering space for the truck and lifting equipment. A 20-foot requires a container truck and equipment capable of lifting 2.5 to 3 tonnes empty.

Maintenance: Extending the Life of a Used Container

Maintaining a shipping container is simple but regular. It determines its longevity, especially outdoors.

• Cleaning: regularly clear the roof and walls of debris and dead leaves, which retain moisture and promote rust.
• Door seals: maintain with talc or silicone lubricant to prevent sticking or drying.
• Locks and hinges: grease periodically.
• Rust: brush affected areas and apply anti-rust paint to stop progression.
• Ventilation: if storing moisture-sensitive products, add ventilation. Condensation forms inside during temperature changes.

Security: What a Container Really Protects

A locked container is not a safe. It offers a deterrent barrier but can be forced. To enhance protection, additional locks, security bars, or alarm systems can be installed. The container's own weight (about 2.2 to 2.4 tonnes) makes it difficult to move without equipment, providing relative protection against theft. If the container is placed on the ground, anchoring or ballasting is recommended, especially in windy regions.

Use Cases: The 20-Foot Dry in Practice

The versatility of the 20-foot Dry is proven in many sectors.

• Construction: tool store, storage of moisture-sensitive materials (cement, plaster), site office.
• Agriculture: shelter for seeds, fertilizers, or small equipment.
• Retail and logistics: buffer stock, picking area, pallet storage.
• Events: technical room, storage of stage equipment.
• Maritime and port: base unit for shipping containerized goods.
• Individuals: storage of garden furniture, tools, bikes, family archives.

In all these cases, check that the container is suited to the load and climate conditions of your region. In coastal or windy areas, anchoring and anti-corrosion maintenance are particularly important.

6-Step Buying Method

1. Define the need: volume to store, weight, static or export use, duration.
2. Choose the format: 10, 20, 40, or High Cube depending on space and volume.
3. Set the condition level: WWT for storage, cargo worthy + CSC for export, one-trip for aesthetics.
4. Request a delivered-on-site quote: container + transport + handling.
5. Inspect the unit: apply the 7-point checklist before payment.
6. Prepare installation: ground, access, anchoring, ventilation, security.

A well-chosen and well-maintained used 20-foot Dry container can serve for decades. At EUR 1,350 for a revised, watertight unit, the robustness-to-price ratio remains hard to beat. The key is not to buy blindly: check watertightness, verify CSC if exporting, anticipate transport and installation, and regularly maintain seals, locks, and paint. Our team in Marseille can assist you in choosing the format and condition level suited to your project.