What Is a Conex Box? Origins, Uses, and How to Buy One

If you have heard the term and wondered what is a conex box, here is the short answer: a conex box is a shipping container. The two terms are used interchangeably, so when someone says conex they are describing the same steel intermodal container you see stacked on ships, trains, and trucks.

Where the name comes from

The word conex traces back to the U.S. military. CONEX is short for Container Express, a standardized reusable steel container system the Army adopted in the 1950s to move equipment and supplies efficiently around the world. The design proved so practical that the broader shipping industry embraced containerization, and the conex name stuck in everyday speech as shorthand for any shipping container.

What a conex box is

A conex box is a corrugated steel container built to be weatherproof, stackable, and tough enough to survive ocean transport. The common sizes are 10', 20', and 40' lengths, all 8 feet wide. A standard unit is 8'6" tall, while a high cube adds a foot for a 9'6" height. A 20' holds roughly 1,170 cubic feet and a 40' about 2,390 cubic feet, giving you a lot of secure, lockable space.

Common uses

Because they are durable and secure, conex boxes have spread far beyond shipping. People use them for backyard and business storage, jobsite tool and equipment lockup, farm and ranch storage, emergency and disaster supplies, and increasingly as the shell for modified offices, workshops, shops, and even homes. Their steel construction resists weather, pests, and break-ins far better than a wood shed.

How to buy one

Buying a conex box is straightforward once you know your needs. First, pick a size, with the 20' suiting tighter sites and the 40' offering the best space per dollar. Next, choose a condition: one-trip for near-new appearance, or used cargo-worthy and wind-and-watertight grades for dependable storage at a lower price. Then decide whether to buy outright, rent monthly, or rent-to-own. Finally, confirm you have a level spot and clear truck access so a tilt-bed delivery can slide the container into place.

Ready to get one? Shipping Container World sells and rents conex boxes nationwide at our guaranteed lowest price, with buy, rent, and rent-to-own options and depot delivery by tilt-bed truck in 3 to 7 business days. Request a free quote and we will help you choose the right box for the job.