Shipping Container FAQ

All ISO deep-sea containers, yes — 2.438 m (8 ft) external width is fixed by ISO 668. The exceptions are US domestic 48/53 ft units (102 in / 2.59 m) and European pallet-wide containers (~2.5 m internal).

20 ft and 40 ft dry containers, plus the 40 ft high cube — those three cover most of the world fleet. 10 ft and 45 ft round out the ISO range; 48 ft and 53 ft are North-America-only domestic sizes.

External 6.058 × 2.438 × 2.591 m; internal 5.898 × 2.352 × 2.393 m; door 2.340 × 2.280 m; capacity 33.2 m³; tare ~2,230 kg; payload ~28,250 kg.

About 3,740 kg for standard height, 3,900 kg for high cube — stamped on each unit’s doors as tare weight.

Structural payload: ~28,250 kg (20 ft) and ~26,700–28,600 kg (40 ft) at 30,480–32,500 kg max gross. Practical road limits are lower: usually 19–21 t of cargo.

25 EUR pallets or 21 US pallets floor-loaded in one tier; up to 50/42 double-stacked when height and weight allow.

11 EUR or 10 US pallets in one tier.

About 30 in a single tier, loaded two abreast in the 2.5 m wide interior — the same count as a 53 ft road trailer.

Roughly 250–300 medium moving boxes (60 × 40 × 40 cm) allowing for imperfect stacking — the geometric maximum is ~346.

Twenty-foot equivalent unit: the capacity of one 20 ft container, the industry’s counting unit. A 40 ft box = 2 TEU; the largest ships carry over 24,000 TEU.

9′6″ (2.896 m) external — exactly one foot taller than the standard 8′6″. Internal height about 2.698 m.

Market-dependent, but typical 2025–2026 ranges: used cargo-worthy 20 ft $1,200–2,500; one-trip 20 ft $2,500–4,000; used 40 ft HC $1,800–3,500; one-trip 40 ft HC $3,500–5,500. Coastal locations run cheaper than inland.

A strong tornado (EF3+) can move or roll an empty container — 2–4 t of box with a large sail area. A loaded or anchored container is far more resistant; hurricane-zone installations bolt castings to ground anchors or piers.

The World Shipping Council averages roughly 1,000–1,500 containers lost at sea annually over recent years — a tiny fraction of ~250 million moved, but real enough to be insured against.

Undeclared hazardous goods (paints, aerosols, lithium batteries beyond limits), perishables in a dry box, people and animals, and cash/negotiables per carrier rules. Hazardous cargo ships legally only when declared under the IMDG Code.

Often yes — many municipalities treat a container as a temporary or accessory structure. Rules hinge on duration, zoning and visibility; check locally before delivery.

No. Containers bear load at the four corner castings, so piers, pads or sleepers under the corners suffice on stable ground. Slabs are for convenience, not necessity.

10–15 years in ocean service; 25+ years as static storage with basic rust care. Corten steel weathers well — the floor and door seals usually age first.

Cargo-worthy units are wind- and water-tight (WWT): door gaskets and roof shed weather at sea. They are not hermetic — condensation (“container rain”) needs ventilation or desiccants.

A container that made a single loaded voyage from the Asian factory to its sale market. Effectively new — the premium grade in the resale market.

Owner code + serial + check digit (ISO 6346), then the size/type code: 22G1 = 20 ft standard dry, 45G1 = 40 ft high cube. Below that, the CSC plate lists tare, max gross and inspection status.

Not directly — corner castings would not align (a 40 ft has no load-bearing points at its midpoint). Two 20s under one 40 works; one 20 under a 40 does not.

Twist-locks between corner castings — the same fittings that secure them to ships, chassis and railcars. Lashing rods and bridge fittings add rigidity in high stacks.

An unventilated steel box in the sun can exceed 50–60 °C inside, and swings drive condensation. Insulation or vents fix both; reefers control temperature actively from −30 to +30 °C.

Only heavy forklifts (15 t+) with fork pockets on 20 ft units. 40-footers must be lifted at the corners — reach stacker, crane or side-loader. A standard warehouse forklift cannot move a loaded box.

Usually nothing physical — a “storage container” is a shipping container sold or rented for static use, often retired from ocean service (WWT grade rather than cargo-worthy).

American slang for a shipping container, from the 1950s US military “Container Express” program. Same box, same dimensions.

One car in a 20 ft; two compact cars (or one large + one small on racking) in a 40 ft; up to four with a dedicated car-rack system in a 40 ft HC.

The International Convention for Safe Containers. The CSC plate on every container door certifies its structural ratings and inspection status — no valid plate, no vessel.

In ISO service, the 45 ft high cube (86 m³). In North American domestic service, the 53 ft container (~108 m³). Specialised 60 ft units exist in tiny numbers on US rail.