A modular shipping container, comprising: an enclosure having a base opposed and spaced from a roof, each of the base and roof coupled to respective ends of opposed and spaced left and right side walls and to opposed and spaced front and back walls, the front and back walls having front and back door openings formed therein, respectively; and, front and back doors sized for mounting over the front and back door openings, respectively, to selectively close the front and back door openings; wherein the front door opening and the front door are smaller than the back door opening and the back door, respectively, whereby the front door is passable through the back door opening.