Container grading confuses a lot of first-time buyers, partly because the vocabulary sounds more precise than it is. There is no single certifying body issuing grades, and “new” rarely means factory-fresh. What follows is what each term means in practice and where the price difference actually goes.
One-trip (often sold as “new”)
A one-trip container was built, loaded with cargo for a single voyage from the factory, and then sold at the destination. It has been used exactly once. Structurally it is as close to new as you can buy without ordering from a factory, with intact seals, sound doors and clean paint.
What it is not is unmarked. A single voyage still involves cranes, twist locks and lashing, so expect light scuffs, small paint chips and handling marks on the corner castings. Anyone selling a one-trip unit as blemish-free is overselling it. If cosmetic appearance genuinely matters — a customer-facing use, a conversion, a site where the container is visible — one-trip is the right call and the premium is justified.
Used: wind and watertight
Wind and watertight is the workhorse grade. The container has spent years in service, shows it, and still keeps weather out. Surface rust, dents, patched repairs, mismatched paint and faded markings are all normal. The structure is sound, the doors work and the roof and seals do their job.
For dry storage on a working site this is usually the sensible buy. You are paying for function rather than finish, and the saving against one-trip is substantial.
Used: cargo-worthy
Cargo-worthy sits above wind and watertight. The unit has been assessed as fit to carry cargo internationally, which means a higher structural standard and fewer accumulated repairs. It still looks used. Buyers choose cargo-worthy when the container may be shipped or stacked, or when they want a better-condition used unit without paying one-trip prices.
Where the money goes
- One-trip: paying for appearance, uniform colour, tight seals and the longest remaining service life.
- Cargo-worthy: paying for verified structural condition and shipping suitability.
- Wind and watertight: paying for a dry, secure box and nothing you do not need.
Cosmetic wear is not structural condition
The most useful habit when comparing units is to separate how a container looks from how it performs. Surface rust on a corrugated panel is cosmetic. A soft floor, a twisted frame or doors that will not seal are not. Our container grades page sets out how we classify condition and what we disclose on each listing.
Buying with confidence
Every unit we sell is described by condition on its listing, and you have a seven-day inspection window after delivery under our refund and returns policy. Walk the container when it arrives, open and close the doors, and check the floor before you load it.
You can filter by size across the 10ft, 20ft and 40ft ranges, or see everything in stock on the inventory page. For advice on a specific unit, call +1 430 280 1063 or email info@marinercontainers.com.
