Saccu (gender unknown)
(with) definite article: ?air reservoir: flexible (usually of animal skin), ready for the insertion of stocks
Term used by Enrico Musichini.
Musichini used sheepskin.
Di Silvestre, Carlo: La zampogna zoppa in Abruzzo. In: La zampogna: gli aerofoni a sacco in Italia (2005), I, p.159.