Abstract: Portable shelters, shelter systems, and methods of deployment of such shelters are described. The shelters or housing units may be deployed in emergency housing situations and may be grouped into systems of shelters. One particular embodiment comprises a rigid top frame structure, a rigid bottom frame structure, and one or more collapsible support arms connecting the top frame structure to the bottom frame structure. The frame structures and the collapsible support arm(s) are sized and configured to form a shelter frame when the collapsible support arm(s) are in a fully extended position, and the top frame structure is brought into proximity with the bottom frame structure when the collapsible support arm(s) are in a collapsed position. Methods of rapid deployment of the shelters and systems of shelters are also described.