Term, mentioned (without any reference, nor basic details, however) in internet sources; NB: Note the discrepancy in locations between the Wikipedia sources.
Sources
Web
Wikipedia (Sackpfeife [➺ Britische Inseln]).
ibidem (Duddelsak [➺ Cornwall]).
NB: i.e. mentioned in German and Lëtzebuergesch (Luxemburg) versions only (NOT detected in English and other versions) !