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Shipping Container Condition Grades Explained
One-trip, cargo-worthy, wind-and-water-tight, as-is — four terms that decide what you pay and what you get. Here's what each grade actually promises.
Grades Are the Language of the Used Market — Learn Four Words
Every used container in New Jersey is described by a grade, and every overpriced or leaky container that ends up in a complaint thread got there because a seller stretched one. The system is simple once someone defines it honestly. Here are the four terms, what they promise, and what they don't.
One-Trip (New)
Manufactured overseas, loaded once, shipped here, sold. Effectively a new container: uniform factory paint, flat unmarked floor, tight gaskets, full 25–35 year service life ahead. The premium buys appearance and lifespan, not extra dryness — a lower grade that's honestly graded is just as watertight. This is the default base for modified builds and front-of-property placement.
Cargo-Worthy (CW)
The workhorse grade. CW means the container passes marine-survey standards for carrying cargo internationally: sound frame and floor, working doors and seals, no structural damage. Expect dents, rust patches, and faded livery — it's an 8–15 year veteran. For storage use it's the sweet spot of the market: certified structure at a used price. Most of what we sell on the used containers page is CW.
Wind & Water-Tight (WWT)
One step down: the box doesn't leak and the doors work, but it hasn't been (or wouldn't be) survey-certified for shipping. More cosmetic wear, occasionally patched panels, lower price. For a container that will sit on the ground holding equipment, WWT is often the rational budget pick — if the seller grades it honestly and you inspect the four failure points listed in the FAQ below.
As-Is
No promises: could be a leaker, a floor-rot case, or just ugly. As-is boxes have legitimate uses (donor units for parts, non-weatherproof coverage), but they are not storage containers and we don't sell them as such. If any seller's "great deal" is silent about grade, assume as-is and walk.
How to Use Grades When You Buy
Two rules. First: the grade goes on the written quote — from us, from anyone. Second: match the grade to the job, not the ego: front-yard visibility or a modified build → one-trip; standard storage → CW; tight budget, back-lot placement → WWT. Current price gaps between the grades are on the prices page, and the full pre-purchase checklist is in the buying guide.
Condition Grade FAQ
Is wind-and-water-tight good enough for storage?
For ground-level storage, usually yes — WWT means no leaks and working doors. What you give up versus cargo-worthy is the structural survey certification and some cosmetic condition, in exchange for a lower price.
What should I inspect on a used container before accepting delivery?
Roof (no ponding dents), floor (no soft spots or chemical stains), door gaskets (pliable, doors close one-handed), and corner castings (no cracks). Ask for dated photos of the exact unit before it ships — we provide them on request.
Who certifies a container as cargo-worthy?
A marine surveyor inspects to CSC (Container Safety Convention) standards. A current CSC plate or survey makes the box legal for international shipping — that's the practical difference between CW and WWT.
Grade Inflation: How to Catch It
The used-container market has a grade-inflation problem the way used cars have odometer problems, and the tells are learnable. "Like new" is not a grade — it's an adjective; make the seller commit to one-trip, CW, or WWT in writing. A CW claim without survey capability is soft: cargo-worthiness is a certifiable standard, so a seller who can't produce or arrange documentation is grading by vibes. Price is evidence: a "cargo-worthy" unit priced at WWT money is usually a WWT unit wearing a better label. And stock photos are a red flag — an honest grader photographs the actual unit, because the grade lives in the details of that specific box. None of this requires expertise, just the willingness to ask questions sellers hope you won't.