A portable building, the portable building including: a body having at least one wall that is adapted to move from a substantially vertical position to a second position; and at least one slideout portion that slides outwardly from the body. The body is substantially the size of an ISO shipping container in a transport configuration.

The present invention relates to a non-arch-shaped rainproof water-collection greenhouse, characterized by: a matrix of upright galvanized steel pipe columns, with adjacent columns fixed by cables connected to their upper ends, forming cable grids. A square greenhouse film with support rods along its edges is installed onto these cable grids. A water-collecting funnel and collection bucket are mounted at the center of the square film. The weight of the collection bucket and rainwater causes the square film to sag into a conical shape. To prevent excessive sagging or tearing, sag-limiting ropes are attached from the top ends of the four steel pipe columns corresponding to the film's corners, supporting the film from below and suspending the funnel and bucket in midair, creating a smooth, controlled sag. This invention features a rational design, simple structure, and minimal steel usage.

A portable building, the portable building including: a body having at least one wall that is adapted to move from a substantially vertical position to a second position; and at least one slideout portion that slides outwardly from the body. The body is substantially the size of an ISO shipping container in a transport configuration.