What grade of container should I buy?

What cargo-worthy actually gets you

Cargo-worthy means the box already earned its keep hauling freight overseas and still passed inspection to do it again. It carries the dents and surface rust of a working life, but the doors seal, the floor is sound, and there are no holes. That is everything a farm shed or a jobsite box needs to do.

Underneath, it is the exact same steel a factory fresh box is made of, 14 gauge Cor-Ten weathering alloy. It is built to rust on the surface and stop there, which is why a used box parked on gravel is working from the same roughly 30 year outdoor life the steel was engineered for, not a shortened one.

When one trip earns its keep

A one-trip container crossed the ocean exactly once before it landed here, so it arrives close to factory fresh: crisp paint, tight door seals, none of the working scars. You are not paying for extra years of service life, you are paying for looks and the tightest seal on day one.

• The box will sit where customers, tenants, or neighbors see it
• You are converting it into an office or a livable space
• You want the cleanest interior possible before a build out
• Resale down the road matters to you

What a cargo-worthy survey actually covers

Cargo-worthy is not a seller's adjective, it is a survey against the criteria that would put the box back on a ship. The corner castings and corner posts have to be sound and square. No cracked welds in the frame. No holes in the roof or the walls. Floor solid all the way across. Door gaskets sealing, locking rods and cams turning the way they should. Dents in the corrugation and orange surface rust do not fail a box, because the frame carries the weight and the frame is what the survey is really about.

A patched floor is the thing that trips people up. On a used box you will sometimes find a section of marine plywood that was cut out and put back, screwed down flush over a plate. Done right that is a repair, not a defect, and it will outlast most of what you set on top of it. What you do not want is a spot that gives underfoot, or a board laid down over rot instead of in place of it. Walk the floor end to end and put your weight on it. That tells you more than the grade name on the listing does.

What the grade does not change

Size, the published prices, the delivery radius, and the welded lockbox are the same whichever grade you land on. Used cargo-worthy is the grade those published figures describe. A 20 ft is $3,200. A 40 ft is around $4,900. Both are delivered and set level at no charge anywhere inside 75 road miles of Woodlawn. Grade moves the sticker above that. It does not touch what the box is built from or how it gets to you.

Wind and water tight is a third option some sellers list. It promises a dry, sealed box without the shipping certification behind cargo-worthy. For land use it does the same job day to day; the certification mostly matters if you plan to resell into the shipping trade later.

How to decide in one visit

Walk the yard before you commit either way. A grade name on a listing tells you what a seller is calling the box, not what condition it is actually in, and that gap is exactly where sight unseen purchases go wrong. Get the seller to point out the exact unit that would be yours, then judge it with your own eyes.