Conex Box - Vietnam
The Conex box (Container, Express) was a cargo container developed by the US during the Korean war to transport supplies and equipment. They were used extensively during the Vietnam war too.
The Conex box was a modular rigid steel box with doors and a standardised size to make stacking them more efficient. They could be stacked three high.
This PLA printed kit measures approx 38mm long by 35mm wide by 35mm high and comprises a single part.