Abstract: The present invention is a protective hooded respirator optimized for both high protection against nuclear, chemical and/or biological agents as well as having a design configuration enabling it to be stored as a highly compact unit. The hood includes a flexible oral-nasal breathing interface interior to the hood. A filter-housing exterior to the hood is fluidly coupled by a single conduit that intakes filtered air during inhalation and exhaled air during exhalation. When in storage, the flexible oral-nasal is folded into a substantially flat configuration.