Did anyone ever use pig bladders in bagpipes?

Answer 1

Probably, but the sheep bladder is smaller and does the trick very well.

I would expect that since a "bagpipe" was most likely originally an instrument from the Middle East historically the choices were a) Goat b) Sheep.... Wild boars becoming Domesticated Pigs came Much later and much further West.

Imagine a Shepard in the field having the light-bulb go off when he discovered the dead Goat bloated.... Naturally, each group of peoples had they're variation of the pipes, from the middle east and much of Africa, Asia have histories long before Scots regiments brought they're style to the Indian subcontinent, South Africa

and the Black sea region during the Napoleonic period... today besides Goat and sheepskins , Bagpipe Bags are also made from Elk-skin as well as Gortex with rubber grommets as stated these Variables are still dependant on availability and on weather in your area of play... sheepskin does not seem as durable as Elkhide, I've had an elkhide Bag since 1992, season it bi annually I live in New England summers are hot and Humid winters Cold and DRY in dryer climes such as down-under Goats and Sheep might be 100 times better ..