I required a proper smoke mask or hood for my office/ brief case kit as I would need to evacuate at least five levels of interior stairways. My research evaluated filtration ( I wanted CO protection), compact size, light weight, ease of use, shelf life and cost. The winner was the (5yr) Xcaper Smoke Mask. YMMV. Usual disclaimer, I have no connection with and do not benefit from the manufacturer/retailer.