Bisecca (f)
(with) definite article: laair reservoir: flexible (usually of animal skin), ready for the insertion of stocks
From a riddle collected in Palagnedra (Centovalli, Ticino): "Cosa cosetta tre gamb e una bisecca", in which the bisecca is the bag, and the 3 gamb [legs] the blowpipe, chanter and drone, respectively.
Biella, Valter: La cornamusa nel Canton Ticino (Appendice [all’articolo] "Il Baghèt"). In: La zampogna: gli aerofoni a sacco in Italia (2005), I, p.22.