What's the difference between CWO and WWT?

Cargo Worthy (CWO) containers hold a valid CSC (Convention for Safe Containers) plate, meaning they’re certified for international ocean shipping. They may have surface rust and dents but are structurally sound.

Wind & Water Tight (WWT) containers are fully weatherproof — they keep rain and wind out — but they’re no longer certified for ocean transport. If you only need a container for storage, a WWT unit saves you hundreds of dollars without sacrificing weather protection.