Šüvyroŋ (gender unknown)
original: šüvə̑roŋ (шӱвыроҥ)
air reservoir: flexible (usually of animal skin), ready for the insertion of stocks
Added information in Mari dictionary: šü•βə̑rə̑m oβarte•m (šüvyrym ovartem [in Cyrillic: шӱ•вырым оварта•ш (-ем) !]): to inflate the bag (of bagpipes).
According to Mari dictionary made of an ox- or horse-bladder; According to the Mari Research Institute, made of a bull- or cow-bladder.