Catégorie : Buying Guides

“Condition grade” is the single most important spec on a container listing after size, and it’s also the most misunderstood. Grades aren’t marketing labels — they come from real inspection standards used across the shipping industry. Here’s what each one actually means.

One-Trip

One-trip containers have made exactly one loaded ocean voyage — from the factory (almost always in Asia) to their first port of call — before being sold. They’re the closest thing to new you can buy: minimal rust, straight panels, and only the cosmetic wear of a single trip. They cost more than used grades but far less than a brand-new, never-shipped unit, which makes them the most popular choice for buyers who want a clean container for a home, office, or business front.

Cargo-Worthy (CW)

Cargo-worthy containers have been inspected and certified fit to carry ocean freight again. They’ve typically made several trips, show real wear — surface rust, dents, faded paint — but have no structural damage, and their doors, seals, and floor all function properly. CW is a solid, cost-effective grade for storage, job-site use, or as a base for modification, since any cosmetic issues get covered up during a build-out anyway.

Wind-and-Watertight (WWT)

WWT containers are no longer certified for ocean freight, usually due to accumulated cosmetic damage or a few small issues, but they’re guaranteed to keep wind and rain out — no active leaks, no holes, and doors that seal properly. This is the budget-friendly grade for straightforward dry storage where structural certification for reshipping doesn’t matter, but a rust-free, leak-free box does.

“As-Is” and economy grades

Below WWT, some containers are sold “as-is” or as economy-grade units — functional but with cosmetic issues, and sometimes small deficiencies like a dented panel or a door that needs adjustment. These are the least expensive option and can work well for very tolerant storage uses, but they’re not a good starting point for a livable conversion.

Which grade should you buy?

For a home, office, or anything the public will see, one-trip is worth the premium. For general storage or job-site use, cargo-worthy or WWT typically offers the best value. Our new vs. used containers guide goes deeper on this decision, and our pricing guide shows how grade affects cost by size.

Inspect before you buy

Whatever grade you’re quoted, ask for current photos of the doors, floor, and roof, and confirm the grade in writing on your order. See our lifespan & maintenance guide for what to check and how long each grade should hold up. Ready to compare grades on real units? Browse our current inventory.

Ready to buy at the right grade? See containers for storage and refrigerated containers for sale to shop by grade and size.

One reason shipping containers are so popular for job-site and business storage is that a steel box is already a lot harder to break into than a wood shed — but the factory door handles and standard padlocks that come stock on most containers are the weakest point in that security. Here’s how to actually lock one down.

Why a standard padlock isn’t enough

The factory locking bars on a container door are secure, but a padlock hanging on the outside of them is exposed to bolt cutters, cutting torches, and prying. A determined thief with the right tools can defeat an exposed padlock in under a minute. That’s the gap a lock box is built to close.

Lock boxes: the standard upgrade

A container lock box is a welded steel housing that covers the padlock and the locking rod handle entirely, leaving only a small keyhole exposed. Because there’s no shackle or body to get bolt cutters or a pry bar around, it removes the most common attack methods outright. It’s a one-time weld-on installation and, for most job sites and storage users, the single highest-value security upgrade available.

Choosing the right padlock

Once a lock box is installed, use a closed-shackle or disc-style padlock rated for outdoor use — the enclosed design resists cutting and picking better than a standard laminated padlock, and a weather-sealed body avoids the rust and seizing that makes locks unreliable after a season outdoors.

Site setup matters as much as hardware

Positioning the container with its doors facing away from the street or a fence line, parking equipment in front of the doors overnight, and keeping the area lit all reduce opportunity without spending anything on hardware. For higher-value contents, some job sites add a simple motion-activated light or camera aimed at the container doors.

Related reading

See our insurance guide for coverage on stored contents, and our guide to containers for construction sites for a full job-site security setup. Browse lock boxes and other accessories to harden any container you already own.

Securing a job site? See our full guide to shipping containers for construction sites and portable storage for business.

Adding power-free monitoring? See our solar security camera & motion light kit.