What Is a Conex Box? Conex vs. Shipping Container Explained

If you’ve shopped for storage, you’ve probably seen the term “conex” used alongside “shipping container.” So what is a conex box, and is it different from a regular shipping container? Here’s the plain-English answer.

What Is a Conex Box?

A conex box is a steel shipping container used for storage and transport. The name comes from “CONtainer EXpress,” a U.S. military program from the 1950s that used standardized steel boxes to move equipment. Today, “conex,” “shipping container,” “cargo container,” “sea can” and “storage container” all refer to essentially the same thing: a durable, weatherproof steel box built to ISO standards.

Conex vs. Shipping Container vs. Cargo Container

There’s no real difference — they’re regional and industry nicknames for the same product:

• Conex box — common in military, construction and the southern U.S.
• Shipping container — the general consumer term.
• Cargo container / sea can — used in freight and shipping.
• Storage container — emphasizes the storage use case.

Common Conex Box Sizes

Conex boxes come in the same standard sizes as any shipping container:

• 10ft conex boxes — compact and portable
• 20ft conex boxes — the most popular size
• 40ft conex boxes — maximum capacity
• High cube conex boxes — extra height

What Are Conex Boxes Used For?

Conex boxes are used for on-site jobsite storage, garage and workshop conversions, equipment and tool security, agricultural storage, emergency storage, and even container homes and offices. Their steel construction makes them secure, stackable and weatherproof.

Where to Buy a Conex Box

StackCrateCo sells new and used conex boxes with nationwide delivery. Browse all shipping containers for sale or check pricing in your city.

Conex Box FAQ

What does conex stand for?

Conex stands for “Container Express,” a 1950s U.S. military shipping program that popularized standardized steel containers.

Is a conex box the same as a shipping container?

Yes. Conex box, shipping container, cargo container and sea can all describe the same standardized steel container.

How much does a conex box cost?

A used 20ft conex box typically costs $1,500–$3,000; a new one-trip unit runs $3,000–$5,000, plus delivery. See our container cost guide.

Looking to buy a conex box? Call StackCrateCo at (312) 998-4030 for new & used conex boxes delivered across the USA.