Bota (f)
(with) definite article: laair reservoir: flexible (usually of animal skin), ready for the insertion of stocks
Probably "bag / wineskin" (compare "boto").
Made of goatskin.
Quijera Pérez, José Antonio: La gaita de odre en La Rioja. In: Cuadernos de sección FOLKLORE 3 (Donostia-San Sebastián, 1990), p.207.