Wind and watertight

The mistake this label causes

Because wind and watertight sounds like a lesser cousin of cargo-worthy, buyers sometimes pass on a WWT box expecting a weaker one. That's backwards. WWT is a real promise on its own: the walls, roof, doors and seals keep water out and the inside dry, full stop. What it skips is a shipping certification that a storage container parked on your property will never need again anyway.

The correct read: for anything staying on land, wind and watertight does the identical daily job as cargo-worthy. The certification matters for a box that might ship again, not for one becoming a shed.

What wind and watertight actually tests for

The label covers exactly what it says and nothing more. Rain, wind-driven or otherwise, cannot get through the walls, roof, door seams or door gaskets. Step inside a true WWT container, close both doors, and it should be pitch dark, no pinholes of daylight anywhere. That dark-box test is the practical way anyone, us included, checks the claim.

It says nothing about cosmetic condition. A WWT box can carry the same surface rust and faded paint as any other used container; the label is about keeping water out, not about how the paint looks.

Where WWT sits between cargo-worthy and as-is

Think of it as the middle rung. Cargo-worthy sits above it with a shipping certification attached to the same dry, sound structure. As-is sits below it: a box sold with known problems and no promise the inside stays dry at all. WWT alone, without the CW certification, is still a legitimate, sound container, it just isn't papered for another ocean voyage.

Does the difference change what you should buy?

For storage on your property, no. We group our used inventory as cargo-worthy and price it together with WWT units because the day-to-day performance is the same: dry, secure, locked. The certification starts to matter if resale is part of your plan, since a certified cargo-worthy box is an easier sell down the road than a WWT-only one. Otherwise, the deciding factor is the box in front of you, not the paperwork behind it.