A portable shelter is provided with a flexible vestibule adapter and a flexible connector connected to the same wall, concentrically surrounding a door. Individual shelter elements may be deployed for functionally different end uses and are protected from weathering and damage when not in use, and the stored elements do not get in the way of other end uses. For example, the vestibule adapter and the flexible connector may be rolled up on themselves for storage individually or together, depending on the desired end-use configuration.