I'm wondering about your destination and a possible differences in culture/translation. The guides on Killamanjaro suggest a 0° rated bag. Are you sure that 0° is Fahrenheit? all the discussion I've seen on this thread assumes Fahrenheit degrees. Nobody in the world except the USA uses °F anymore. Is it possible the they meant 0° Celsius? That would change the bag required considerably. You might want to confirm the units of measurement before you buy.