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A Conex box is a secure storage container made of steel. It can be easily transported and has corrugated sides for structural strength. They securely ship stored materials from one continent to another but are also used for storage, moving and more. Southwest Mobile Storage rents and sells Conex boxes for construction, commercial and residential use. They come in several sizes. The most common sizes are 20ft and 40ft steel shipping containers. However, there are larger and smaller sizes available. You can also rent multiple containers of the same size or varying sizes.

SMS has locations in Phoenix, Tucson, Denver, Los Angeles (Rancho Cucamonga) and San Diego. We welcome you to visit our yard and consider the containers we offer for rent and sale. We can also provide you with a quote over the phone. Our branch locations offer delivery and pickup options, along with complete service and support. We have a container yard in Colorado Springs that we deliver containers from, but is not open for visits.

What are Conex Boxes?

The name Conex refers to the type of storage container produced by the U.S. Army in the early 1950s. The name refers to Container Express (hence, ConEx), the logistics system that utilized those containers. Today, Conex is a general term for shipping containers. Other names for these steel boxes are intermodal containers or sea cans.

The U.S. Army still produces a container called a Tricon, similar to the Conex boxes of the past. Three Tricon 8ft x 10ft containers can be welded side by side and are equivalent in size to a single 20ft container.

Conex boxes are widely used by a variety of professions to store materials and keep them safe from the natural elements. In this blog, we’ll discuss the uses, types and benefits of containers.

Uses of Conex Boxes

You can use Conex boxes in a variety of situations. Construction sites commonly use containers to store materials, from pipes to electrical wiring. But though that might be the most common place to spot a Conex box, it’s not the only place they’re used. They can also be found in a variety of commercial industries. In addition to storage use, they have been utilized in projects as varied as wastewater-treatment services and concession stands. They can also be modified into temporary workspaces for remote workers or employees waiting for a new office building to be constructed.

What is the Size of a Conex Box?

The most common container sizes are 20ft and 40ft in length.

• 20ft x 8ft x 8ft 6in (Volume of 1,360 ft3)
• 40ft x 8ft x 8ft 6in (Volume of 2,720 ft3)

A Southwest Mobile Storage Conex box sits under a blue sky with puffy white clouds.
A shipping container can protect valuable equipment and tools from theft and weather damage. Containers are difficult to break into without heavy machinery, giving you peace of mind for your stored material.

Types of Conex Boxes

Depending on the container’s intended purpose, there are a few distinct types of Conex boxes. Whether you need to store materials, create an accessible workspace or need specially designed containers, Conex boxes are versatile enough to serve your needs.

Conex Storage Box

Conex storage boxes can range in quality from like-new one-trip containers to worn as-is units. However, all Southwest Mobile Storage Conex boxes are guaranteed to be wind and weathertight and offer secure storage protected from the elements.

Ground-Level Offices

Ground-level offices are portable workspaces that allow workers to remain productive even if their primary office is under construction or otherwise unusable. These Conex boxes are commonly used on construction sites, outside office renovations and elsewhere.

Ground-level offices are available in many sizes and configurations to suit the specific needs of different businesses. They include a range of features to make the workspace more comfortable, including air conditioning, heating, lighting, electrical outlets, shelving and furniture.

High Cube Conex

Standard Conex boxes are 8ft 6in tall, but high-cube containers may be an option for those wanting to store oversized items like furniture, building equipment and other difficult objects. These storage boxes offer an additional foot of height, allowing for the storage of more items than a standard Conex box.

Modified Conex

You can modify containers for a number of uses. For instance, they’ve been used successfully across various industries like hospitals and public services. At Southwest Mobile Storage, we can add helpful components to make your Conex unique.

Benefits of Conex Boxes

Containers can withstand harsh conditions at sea. Its floor can bear heavy loads and distributes weight evenly to the container corners. These corners have four bottom fittings to ensure the container remains secured and stackable. In addition to this, Conex boxes can maintain their structural integrity even when exposed to temperatures ranging from -22 to 149 degrees Fahrenheit.

Most Conex boxes have a four-bar, eight-cam locking system. However, our Conex boxes at Southwest Mobile Storage also feature a customized slide bolt and lock box system, offering higher security. This ensures that illegal access is almost impossible while making it easy for authorized personnel to access the container’s contents.

Containers are highly versatile and suitable for various applications, including shipping, storage and construction. Thanks to their portability, they are easy to move from one location to another. You can move them with a forklift for short distances and deliver them on a truck bed for longer journeys.

Conex boxes provide ample space, making them ideal for storing assorted items. They offer a larger and more secure storage space than other available options. Loading items into a Conex box is safer and more accessible at ground level. This eliminates the need for an elevated truck bed and makes storage more efficient.

Conex Box Modifications and Customizations

Modifying Conex boxes have become increasingly popular, as they offer a cost-effective and sustainable solution for custom storage needs. Because the corrugated steel of containers requires specialized tools and expertise to customize, choosing a company with experience and resources is essential to ensure high-quality modifications. With the help of Southwest Mobile Storage and our team of expert fabricators, it’s possible to transform a steel box into something new, from tack rooms to garages and even vehicle storage.

We have over 25 years of experience customizing thousands of containers for national and international customers. With our certified fabrication experts and 90,000 sq ft fabrication facility, we deliver consistent quality and fast turnaround while ensuring the container is built to your specific needs.

Several southwest mobile storage conex boxes sit stacked on top of each other.
Conex boxes can be used for a variety of purposes. From storage containers to office containers, modified containers and more, you can find exactly what you need to keep your operations running smoothly.

How to Buy or Rent a Conex Box

If buying or renting a Conex box interests you, the process is straightforward. By following these steps, you can quickly get a quote for your desired container.

Step 1: Get a Quote

First, request a free quote by completing an online form or contacting our office. You’ll need to answer a couple of questions to give us a better idea of what your container needs are. We need to know about the type of container you’re interested in, how long you’re thinking of renting, how soon you’ll need it and the SMS branch nearest to you.

Step 2: Speak to a Rep

Next, speak with a container representative who will provide a quote based on your specific needs. They can help you decide on the size and type of Conex box that best suits your requirements.

Step 3: Schedule Your Conex Delivery

Finally, once you have received your quote, you can schedule your Conex box delivery. You’ll also need to prepare the location, ensuring there is enough space for your container. Level the ground and clear any debris or obstacles hindering the delivery process.


You can customize containers to meet specific needs, making them a cost-effective and sustainable solution for various applications. Whether you need to store materials, create a temporary workspace, or transport goods across continents, Conex boxes offer a reliable and secure option for all your storage needs.

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