Conex Box in Missouri: A Complete Guide for Missouri Buyers

What is a Conex Box?

The word conex (sometimes spelled CONEX) is short for "container express," a term coined by the United States military in the 1950s for a standardized steel shipping container used to move equipment and supplies during the Korean War. The original CONEX boxes were 8.5 feet by 6 feet by 6.8 feet, much smaller than today's intermodal units, but the principle was identical: a stackable, lockable, weatherproof steel box that could move by truck, rail, or ship without unpacking.

By the late 1960s the commercial shipping industry had standardized on 20-foot and 40-foot intermodal containers, the units you see on every cargo ship and rail line today. The military term stuck in everyday speech. Many people still call any large steel storage box a conex, even when the unit is technically an ISO shipping container or a purpose-built storage container.

Whichever name is used, the container is a corrugated steel box, 20 or 40 feet long, with cargo doors on one end.

Conex Box vs Shipping Container vs Storage Container

The vocabulary lines up like this:

• Conex box. Originally a military-spec container. In modern use, a colloquial name for any steel shipping container used for storage. Most commonly applied to 20-foot and 40-foot units in residential and contractor settings.
• Shipping container. The technical term for an ISO-standard intermodal container. These are the units that cross oceans on cargo ships. They are built to ISO 1496 specifications, which dictate dimensions, lifting points, and structural strength.
• Storage container. A general retail and rental term used by ground-storage companies. Often refers to the same intermodal unit, but the phrase also covers purpose-built ground-level containers that have never seen ocean service.

If you are shopping for storage, the difference rarely matters. The same physical unit can be sold as any of the three. What matters more is the size, the condition grade, and the delivery logistics.

Standard Conex Box Sizes

There are three standard sizes:

• 20-foot standard. Length 20 ft, width 8 ft, height 8 ft 6 in. Interior floor about 19 ft 4 in by 7 ft 9 in, with 7 ft 10 in of height.
• 40-foot standard. Length 40 ft, width 8 ft, height 8 ft 6 in. Roughly 2,350 cubic feet, double the 20-foot. Best for contractors, farms, and businesses.
• 40-foot high cube. Length 40 ft, width 8 ft, height 9 ft 6 in. The extra foot of headroom adds about 350 cubic feet of usable space, which matters when you store racked goods or tall equipment.

Specialty sizes (10-foot, 45-foot, refrigerated, double-door, side-opening) exist but are less common.

Common Uses by Industry

In Missouri, containers can serve these industries:

• Beef cattle, hay and row crop farming. North Missouri and the Ozark border counties are cow-calf country, mid-Missouri and the river bottoms are corn and soybeans, and a container can give those operations storage that locks, stays dry and can sit on a field edge without a foundation.
• Bootheel row crop agriculture, which is a different business from the rest of Missouri farming. The seven county Bootheel grows cotton and rice alongside soybeans, corn, wheat, watermelon and peaches, on ground drained by the Little River Drainage District. Gins, elevators, equipment dealers and irrigation contractors in Sikeston, Kennett, Portageville and Malden can keep parts and equipment in lockable containers.
• Vehicle assembly and the supplier base. Missouri builds full size vans and midsize trucks at the Wentzville plant in St. Charles County and pickups and commercial vans at the Claycomo plant in Clay County, and both draw supplier yards, sequencing centers and logistics operations around them. Those yards can use 40ft high cubes for racked parts storage.
• Aerospace and defense manufacturing in north St. Louis County, which builds military aircraft and has for generations, plus the machining, composites and tooling shops across St. Louis and St. Charles counties that feed it. Secure, weatherproof on-site storage can be useful on that kind of campus and on a construction project that touches it.
• Animal health. The Kansas City Animal Health Corridor runs from northeast Kansas across the metro to Columbia, with vaccine and pharmaceutical manufacturing in St. Joseph and research operations around Columbia and the Kansas City suburbs. A plant expansion can use containers for on site storage during construction.
• Freight, rail and barge logistics. Kansas City has intermodal yards, cross-dock operations and the underground warehouse complex carved into the limestone bluffs northeast of downtown. St. Louis has barge terminals on the Mississippi. Both metros have warehouse and distribution corridors that can use containers as overflow and staging.
• Lead, limestone and industrial minerals. The Viburnum Trend in southeast Missouri is a lead producing district, and limestone and aggregate quarries operate across the state. Mine sites, quarries and the contractors who serve them can use containers for tools and parts, because a lockable steel box can sit on a rough site.
• Poultry and food processing in southwest Missouri, in McDonald, Barry, Lawrence and Newton counties, along with turkey and pork operations in mid-Missouri and meat and grain processing in St. Joseph and the Sedalia and Marshall corridor. Grow-out farms, feed operations and processing plants can use containers for feed, equipment and seasonal storage.
• Brewing, distilling, winemaking and food manufacturing, anchored by the brewery complex in south St. Louis and spread across the state through craft producers in Kansas City, Springfield and Columbia. The Missouri Rhineland along the Missouri River between Augusta, Washington and Hermann is wine country, and Augusta was the first federally recognized American Viticultural Area. Vineyards and wineries can use containers for barrel, equipment and harvest storage.
• Tourism and outdoor recreation in the southern half of the state. Branson's theaters and Silver Dollar City, the Lake of the Ozarks, Table Rock and Bull Shoals, the Current and Jacks Fork rivers in the Ozark National Scenic Riverways, and the Katy Trail across the middle of the state support marinas, outfitters, campgrounds and resorts that can store seasonal gear in containers.
• Higher education, healthcare and the military installations. The university campuses at Columbia, Rolla, Springfield, Warrensburg, Maryville, Kirksville and Cape Girardeau, the hospital systems in both metros and in Springfield and Joplin, Fort Leonard Wood in Pulaski County and Whiteman Air Force Base at Knob Noster all have construction and event operations that can use containers for storage on site.

Common uses:

• Tool, chemical, and equipment storage at working yards. Steel walls, lockable doors, and on-site placement make a conex a practical substitute for a built shed, a fenced compound or a temporary office.
• Weather-event storage for documents, heirlooms, and inventory.
• Construction jobsite storage on long-cycle builds. Project-driven needs where timing, access, and short-term affordability all matter.
• Acreage and farm storage. Permanent storage for the things a garage or barn cannot fit.

How to Choose the Right Conex Box

Three questions narrow the decision quickly:

1. How much space do you need? List what you intend to store. A 20-foot unit works for household goods during a renovation, materials for a residential framing job, or a few pallets of stock. A 40-foot unit doubles that. Compare the list with the container dimensions before you choose.
2. How clean does the interior need to be? If you are storing tools, equipment, or boxed goods, a used wind-and-water-tight unit is fine. If the unit will be converted to an office, a workshop, or a clean storage space, a one-trip unit saves the cost of repainting and floor refinishing later.
3. Will it move? If the container will sit on a single property for the whole life of its use, buying makes sense. For a project that ends in a few months, compare the cost of renting from a rental company with the cost of buying. Our rent vs buy guide walks through the crossover math.

How Delivery Works in Missouri

Conex boxes are delivered on a tilt-bed (sometimes called a roll-off) truck. The driver tilts the bed up, and the container slides off onto your placement site. Delivery follows this sequence:

1. Site assessment. Container One reviews the access route, the placement spot and the overhead clearance before scheduling. A 20-foot delivery needs 110 feet of straight clearance. The truck needs at least 15 feet of height to drive, at least 22 feet of height along the entire unloading path, and at least 10 feet of width. A 40-foot delivery needs 130 feet of straight clearance.
2. Surface check. Concrete, asphalt, gravel, hard-packed dirt, and grass all work. Soft, waterlogged, or steeply sloped ground may need preparation.
3. Final placement. The driver sets the container down on the prepared spot.

Container One's Delivery/Dispatch department schedules each delivery after payment and site review. Delivery areas across Missouri:

• St. Louis, St. Charles, Jefferson and the river counties, served from the St. Louis depot under six miles from downtown
• Kansas City, the Northland and eastern Jackson County, served from the Kansas City depot about 16 miles from downtown
• Springfield, Branson and the Ozarks, served from the Kansas City depot about 151 road miles away

Permits and Local Rules

Permit rules depend on the municipality. Before ordering, check with your local building or planning department, and verify HOA rules if they apply. The permit guide for this state covers the questions to ask: container permits in Missouri.

What a Conex Box Costs in Missouri

Pricing is ZIP-specific, because delivery is part of the price. Missouri delivered pricing: starting at $2,332 for a 20ft Wind and Water Tight container delivered in St. Louis. Prices as of 2026-08-06.

If you would rather spread the cost, rent-to-own is available through a third-party partner, My Container Rental.

Frequently Asked Questions About Conex Boxes