Bags of mystery (common).—Sausages and saveloys are so called—from the often mysterious character of their compounds. Presumably composed of minced ‘meat,’ but so highly flavoured and seasoned that no man can tell whereof they are made.
John S. Farmer. in Slang and its Analogues Past and Present (1890)
Bags of mystery is a podcast about creativity, about celebrating the creators with a vision and how they make that vision a reality.