Abstract: A portable structure that, without disassembly or separation of its basic parts, can be rapidly transformed between its fully erected configuration and its fully collapsed configuration by one individual unaided by another person. The structure, in its collapsed configuration, can be easily carried by one individual. In its expanded configuration the structure is instantly stable when placed on the ground. In one embodiment the structure serves as a light weight beach cabana that can be easily carried by a child. The basic portable structure does not require separation and reassembly of its components at any time before, during or after transformation from the collapsed or expanded configuration.