When buying a shipping container, one of the most important decisions you’ll make is choosing between Wind and Water Tight (WWT) and Cargo Worthy (CW) grades. Each has distinct advantages depending on whether your goal is affordable storage, construction, or certified international shipping. This 2025 guide breaks down their differences, pricing factors, and ideal use cases—so you can make the right call the first time.

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What Are Shipping Container Grades?

Shipping container grades indicate the structural and functional condition of a container. They determine whether it’s suitable for domestic storage, international transport, or conversion projects like container homes and pop-up shops. Two of the most common grades are WWT and CW.

Wind and Water Tight (WWT)

WWT containers are secure against the elements. While they’re no longer certified for ocean shipping, they remain fully sealed against wind and water—making them ideal for onshore projects and storage.

Guaranteed to protect contents from moisture and drafts.
May have visible wear like rust, dents, or fading paint.
Excellent for affordable storage, site offices, or container builds.

For example, farmers often use WWT containers for storing feed, equipment, and seasonal goods. Builders and DIYers love them for low-cost storage or workshop setups. Their durability also makes them perfect foundations for creative projects featured in Creative Shipping Container Uses 2025.

Cargo Worthy (CW)

CW containers meet all international shipping standards. In addition to being wind and water tight, they’re structurally inspected and certified with a CSC plate—proof that they’re ready for export and long-distance transit.

Structurally sound and safe for cargo shipment.
Minimal cosmetic wear, often newer or refurbished.
Includes a valid CSC certification plate for transport compliance.

Because of their condition and inspection requirements, CW containers cost slightly more than WWT units. However, they’re ideal for businesses shipping goods internationally or those needing high-security storage solutions. For more on certification standards, review the International Maritime Organization (IMO)’s CSC guidelines.

Key Differences Between WWT and CW Containers

Feature	Wind and Water Tight (WWT)	Cargo Worthy (CW)
Condition	Watertight; may have surface wear	Structurally sound for active shipping
Certification	No CSC plate	CSC plate-certified
Usage	Storage, workshops, construction	International shipping, secure storage
Cost	Lower (budget-friendly)	Higher (inspection & certification)

Examples of Use Cases

WWT Containers

Storage: Secure, weatherproof storage for tools, materials, or household items.
Construction projects: Common in shipping container transformations and modular builds.
Seasonal use: Ideal for agricultural and farm storage where certification isn’t needed.

CW Containers

International transport: Ready for global shipping and intermodal transit.
Secure business storage: For companies needing long-term, inspected, and reinforced units.
Remote operations: Often converted into mobile offices or jobsite stations.

Which Grade Should You Choose?

Here’s a quick guide to deciding which container best suits your needs:

Choose WWT if you need affordable, weather-resistant storage or are building a container home, studio, or workshop.
Choose CW if you’re planning international shipping, long-term rentals, or secure commercial storage.

Still unsure? Compare your options in our detailed guide Used Shipping Container Grades: WWT, CW, As-Is & One-Trip.

How to Buy Quality Containers

At YES Containers, we provide both WWT and CW containers across all major depots. Whether you’re in Texas, Florida, or California, our team can help you find the right size and grade for your project. For a quick estimate, visit our Get a Quote page or explore our Shipping Container Sales & Services 2025 overview.

FAQs About Shipping Container Grades

Can WWT containers be used for shipping?

No. WWT containers lack the required CSC certification for international freight transport but remain excellent for storage and builds.

What does the CSC plate certify?

It certifies that the container is structurally sound for cargo transport and compliant with international safety standards.

Can CW containers be used for storage?

Absolutely. Many buyers use CW containers for high-security storage due to their structural strength and integrity.

How can I verify a container’s grade?

Check the condition, CSC plate, and documentation. You can also refer to our Container Inspection Process Guide for detailed verification steps.

Are WWT and CW containers weatherproof?

Yes—both grades are wind and watertight. The key difference lies in certification and structural inspection levels.

Related Resources

Ready to get started? Whether you need a certified Cargo Worthy unit or a budget-friendly Wind and Water Tight container, Get a Quote today and let our experts help you find the perfect match for your project.

How to Choose Between WWT and CW Shipping Containers: 2025 Buyer’s Guide