Buying Used Shipping Containers: What to Know Before You Buy

When you browse online for used shipping containers, you will see terms like “wind and water tight” or “cargo worthy” thrown around. But what do those things actually mean? To find the used shipping container that is right for you, we've outlined a few smart guidelines.

Used shipping containers are a cost-effective solution for extra storage, and you've probably even seen some creative build-outs made with used shipping containers. (My town even has a shopping center built around shipping containers!) It's important to know that they're not all of the same condition or quality, so let's review a little bit about how to determine the condition, and potential pitfalls that can save you time, money, and a whole lot of frustration. Whether you’re a contractor looking for jobsite storage or a business owner in need of overflow space, we’ll help you make a confident, informed choice.

New Shipping Containers vs. Used Shipping Containers

When it comes to buying a shipping container, one of the first decisions you’ll face is whether to go new or used. But what's the real meaning of that? Unless you're having a container hand-built for you, all shipping containers are essentially used shipping containers, unless you purchased it from a factory that builds them.

In this industry, new just means “one-trip." In other words, they've made a single journey from the port where they left their country of origin to their destination port in the United States. They come at a higher price point, but that premium gets you a container in near-perfect condition with a longer lifespan and fewer worries about rust or structural issues down the line.

Used Shipping Containers

Used shipping containers are more budget-friendly than one-trip, yet still extremely durable, since they were built for ocean travel and the rough handling of freight yards. They may have made several ocean trips, but they typically still have a lot of life left in them. There are several condition grades. 

Used containers are a solid choice for:

• Jobsite tool and equipment storage
• Inventory overflow
• Farm or field storage
• Anyone who doesn’t mind a few dents and scrapes in exchange for savings

If your top priority is cost and you don’t mind more wear and tear, a used container will do the job just fine. But if you want the least amount of wear and tear, or the longest life possible, it might be worth investing in a one-trip unit. Either way, knowing what to EXpect, and what to INspect, will help you make a smarter decision.

Understanding Condition Categories of Used Shipping Containers

Let's get cozy with the terminology around the condition of used shipping containers. There are some common terms that describe condition, like "wind and water tight" or "cargo worthy." These labels are pretty self-explanatory. The hardest part is deciding what suits your needs.

Next, is a breakdown of the most common container condition categories so you can shop with confidence.

New / One-Trip Shipping Containers

As mentioned previously, you can expect these shipping containers to show very little wear. They will likely still have standard ISO markings on the doors and sides to identify their type and size, some tracking information, and they will carry the logo of the shipping line. Other than that, they will be relatively clean and should last many years, even decades. They're especially popular for custom modifications and long-term installations. 

These containers are as close to new as you can get without buying directly from a factory. They’ve made one trip carrying cargo overseas and are then sold off by the shipping line.

Expect:

• Minimal wear
• Clean floors and interiors
• A few scratches or a dent or two from the loading/unloading process
• A long service life

If aesthetics are your biggest concern and cost is not a factor, one trip shipping containers are for you.

Cargo Worthy (CW) Used Shipping Containers

Used shipping containers that are cargo-worthy still meet the structural standards required for international shipping. They may still have a CSC plate, but if used for ocean travel, they would need to be recertified at an additional cost. 

Expect:

• Structurally sound and stackable
• Functional doors and solid flooring
• Cosmetic blemishes like surface rust or dents

Cargo-worthy used shipping containers are best for rugged job sites, overseas shipping (when recertified), or those who value durability over appearance.

Wind and Water Tight (WWT) Shipping Containers

One of the most common grades for on-site storage is "wind/water tight." This term means the container no longer meets international shipping standards, but is sealed against the elements. 

Expect:

• No leaks, doors that seal properly, and an interior that stays dry
• More visible wear and tear
• Still very usable for stationary storage

It should be understood that there is some nuance to the term wind/water tight. A WWT shipping container will keep out rain, wind, and pests for practical purposes like storage, but it isn't airtight, so moisture can still build up inside due to condensation or humidity. 

A wind and water tight used shipping container is best for inventory overflow, jobsite tool storage, farm equipment, or any use where function matters more than looks, and it will never be needed for cargo shipping.

As-Is Used Shipping Containers

As the name suggests, you're getting the container in its current state, there will be no repairs, and no guarantee (depending on the company that you purchase it from). These are typically older units that may have holes or rust, damaged doors or floors, or structural issues. 

An as-is used shipping container is best for DIY repairs, scrap material use, or for buyers with the skills (and budget) to fix them up.

Refurbished Shipping Containers (And Why We Don't Sell Them)

Refurbished used shipping containers have been repaired and repainted, but might not meet cargo-worthy standards. It means they’ve had a bit of a facelift. We don't carry them, and here's why. 

On the surface, they look great. The idea is that you’re getting a container that’s been cleaned up and made to look new again. But here’s the catch: there’s no universal standard for what “refurbished” means, so it’s hard to know exactly what you’re getting.

Expect:

• Who really knows?
• Some refurbished containers may be in excellent condition, others may have only had a quick paint job to cover surface flaws, without addressing underlying damage like rust, floor rot, or door issues.

In some cases, a container may have structural problems hidden under a fresh coat of paint. At SiteBox, we don't recommend buying refurbished containers, and we don't stock them. 

Of course, these are just the conditional terms, not official standards. Keep your eyes open to avoid surprises and choose a container that fits your project, budget, and expectations.

In the next section, we’ll cover what to look for when inspecting a used container in person—or what to ask if you’re buying remotely.

What to Inspect in a Used Shipping Container

Once you’ve narrowed down the conditional category that fits your needs, it’s time to dig a little deeper. Knowing what to inspect in a used shipping container can help you avoid surprises and ensure you’re getting solid value. We've created this checklist to help you evaluate a used shipping container before you buy:

✅ 1. View the Doors and Seals of the Shipping Container

• Open and close both doors fully. Do they swing smoothly?
• Check the rubber gaskets around the door edges for cracks, gaps, or signs of dry rot.
• Make sure the locking gear functions without needing a crowbar or a second person.

Why it matters: If the doors don’t seal tight, your container won’t be wind or water tight—period.

✅ 2. Inspect the Roof and Corners

• A simple way to spot leaks is to stand inside, with the doors closed and look for pinholes of light.
• Inspect the roof for dents or soft spots, especially toward the center (where water tends to collect).
• Check the corner castings for rust or distortion. These corners are key to structural stability and stacking.

Why it matters: Damage in these areas could mean water intrusion or reduced structural integrity.

✅ 3. Floors of Used Shipping Containers

• Most containers have marine-grade plywood floors. Look for soft spots, stains, or signs of rot.
• Walk the entire floor and feel for spongy areas.
• If you can, check the underside to look for corrosion or missing support cross-members.

Why it matters: A weakened floor can be unsafe for loading heavy equipment or storing inventory.

✅ 4. Rust and Corrosion

• Some surface rust is normal on used containers, but check for deep pitting, especially on the roof, seams, or bottom rails.
• Look at welds and around the door frames, where rust tends to spread first.

Why it matters: Cosmetic rust is manageable, but structural rust could shorten the container’s lifespan or make it unfit for certain uses.

✅ 5. Alignment and Shape

• Step back and check if the container looks square. If it leans or bows, it could signal warping.
• Make sure the doors align properly and don’t require brute force to latch or unlatch.

Why it matters: Warped containers are harder to secure, modify, or stack, especially for long-term or commercial use.

What to Watch Out For When Buying a Used Shipping Container

Whether you’re walking the yard or getting photos from a vendor, these checks can help you spot red flags before you commit. And when in doubt, buy from a trusted seller who stands behind their product. (Look for reviews online, if possible.) Peace of mind is worth a lot more than a deal that's “too good to be true."

Used shipping containers are a smart investment, but like any secondhand purchase, there are pitfalls to avoid. The last thing you want is to spend your budget on a container that leaks, can’t be delivered, or worse, doesn’t exist. Here are some red flags and buying traps to watch out for.

🚩 Unverified Sellers or Shady Websites

If the website has no physical address, no phone number, or only communicates by email or text, you should proceed with caution. Scams in the used container market are surprisingly common, especially on social media or classified ad sites.

Tip: Always verify the company’s legitimacy. Look for online reviews, business registration, and whether they own or operate their delivery fleet. The buyer may make excuses, but don't make concessions for a buyer you know nothing about. 

🚩 No Interior Photos or Vague Descriptions

If the listing shows just one photo (especially only of the exterior), that’s a red flag. A reputable seller should be able to show the actual unit or at least detailed photos of a representative one, both inside and out.

Tip: Ask for photos of the floors, doors, interior corners, and roof. And if the seller won’t provide them? Move on.

🚩 “Too Good to Be True” Pricing

Yes, used containers save money, but if you’re quoted a price way below the market average, something is probably off. That low number may not include delivery. There may be unseen costs, or the container might have hidden damage.

Tip: Get the full picture. Ask for a breakdown of costs, including delivery, taxes, and any additional fees.

🚩 No Delivery or Sketchy Logistics

Some sellers will drop the container curbside and leave you to figure out the rest. Or, they'll leave you with a container that can’t be delivered to your site because of access issues. 

Tip: Make sure your seller asks the right delivery questions up front. They should ask about the space in which they will be placing it, ground conditions, and clearance.

🚩 No Return Policy or Written Agreement

A handshake deal sounds friendly, but when you're spending serious money on heavy steel, a little paperwork goes a long way.

Tip: Make sure there’s a clear agreement in writing that includes the container's condition, how it will be delivered, and what happens if something isn’t as promised.

Always buy from a supplier you trust with a stellar reputation. A used container is only a bargain if it does the job right, and keeps your tools, inventory, or equipment safe and dry for years to come.

Why SiteBox Storage Is the Smart Buy for Used Shipping Containers

A used shipping container can be one of the most practical investments you can make, if you know what you're getting. Doing this little bit of homework upfront can save you time, money, and major headaches down the line. The real "secret"? Buying from a trusted source with a reputation for quality and service.

At SiteBox Storage, we offer high-quality used shipping containers with transparent pricing, real photos, and delivery handled by our own team. We've been in business since 1998, and we've built a reputation to go with that. Our friendly field reps will help you find the right container for your project, with no guesswork or gimmicks. Contact us today.