Standard Shipping Containers

Find Verified Standard Container & Conex Box Suppliers

One-Trip, Cargo-Worthy & WWT grades
10ft, 20ft & 40ft standard sizes
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ContainerMondo lists Standard Containers suppliers and connects you with a nationwide network of verified sellers, so you can compare condition grades, sizes and delivery quickly and easily. Standard containers are also known as dry containers, conex boxes, storage containers, and cargo containers.

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Condition grades

The grade matters more than the photo

Two 20ft standard boxes can be hundreds of dollars apart, and the reason is almost always condition grade rather than size. Here is what each label means and which one fits your job.

One-Trip

Best condition

Built overseas and shipped just once to reach North America, so it arrives near new: clean paint, tight sealing doors, minimal wear, and the longest service life still ahead of it. It is the priciest grade.

Best for conversions, offices, anything on show, or when you want it to last decades.

Cargo-Worthy (CW)

Best value

Certified structurally sound and seaworthy by an inspector, meaning watertight, solid floor and working doors, with honest cosmetic age such as surface rust and faded paint. This is the grade most buyers land on.

Best for shipping cargo, long term storage, and ground level storage that still has to be reliable.

Wind & Water Tight (WWT)

Storage pick

Keeps wind and rain out and holds its shape, but is not certified for ocean freight and usually shows more age and past repairs. Generally cheaper than Cargo-Worthy.

Best for stationary on site storage where looks do not matter and you will never ship it.

As-Is

Lowest price

Sold with its faults disclosed, which may mean a soft floor spot, a patched hole, dents, or a sticky door. Only worth it if you can inspect in person and the flaws do not affect your plan.

Best for tight budgets and heavy modification builds you will cut into anyway.

Also worth knowing: you may see IICL, the strictest inspection standard, a notch above Cargo-Worthy and used mostly for leasing fleets. If you need temperature control rather than a dry box, compare refrigerated containers instead.

Sizes and dimensions

The numbers that decide what fits

Exterior size is only half the story. What you can actually load is set by the interior dimensions and, the part people forget, the door opening. Here are the real figures for the three standard sizes.

10ft

compact

Exterior10′ × 8′ × 8′6″
Interior (usable)≈ 9′4″ × 7′8″ × 7′9″
Door opening≈ 7′8″ × 7′5″
Capacity≈ 560 cu ft
Floor area≈ 75 sq ft

View 10ft details →

20ft

40ft

maximum capacity

Exterior40′ × 8′ × 8′6″
Interior (usable)≈ 39′5″ × 7′8″ × 7′10″
Door opening≈ 7′8″ × 7′5″
Capacity≈ 2,385 cu ft
Floor area≈ 304 sq ft

View 40ft details →

Standard vs. High Cube: a standard container stands 8′6″ tall. A High Cube adds a foot at 9′6″ for roughly 8′10″ of interior height, which is worth it for tall pallets, bulky loads, or headroom in a conversion. Want them side by side? See the full size guide. Figures are approximate and vary slightly by manufacturer.

Before you buy

Inspect it, then make sure it can land

A standard container is a big, heavy, semi permanent purchase. Two things protect you: a proper inspection and realistic delivery access at your site.

Inspect it: 5 point check

Roof and corners: press for dents, because a bowed roof pools rainwater.
Light test: step in, shut the doors, and look for pinholes of daylight, which mean a leak.
Floor: probe the marine plywood for soft or rotten spots and chemical stains.
Doors and seals: they should swing true, seal all round, and the locking bars should turn freely.
Rust: surface rust is cosmetic, but flaking or perforating rust is structural, so walk away.

Get it delivered

Tilt bed access: the truck slides the box off the back and needs roughly the container's length again in straight, firm clearance.
Tight sites: with no room to tilt, a crane or hiab can place it, but it costs more.
Set it level: on blocks or railroad ties so water drains and the doors stay square.
Delivery is the swing cost: distance from the nearest depot often moves the total more than the grade does.

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