Abstract: A collapsible ground sheet has a floor made of a sheet of flexible, waterproof or water-resistant material, and walls attached to the floor and extending from the floor in a top direction. The walls are arranged about the periphery of the floor in series in a ring formation such that each of the walls has two neighboring walls. Each wall has a fabric portion and a wire loop, the wire loop disposed near the periphery of the fabric portion such that the fabric portion is supported by the wire loop. Each of the walls attached to its two neighboring walls by hourglass-shaped gussets made of a sheet of flexible material.