3.Although pig-bladder soccer balls were quite resistant, they were extremely light and could not have been used for more than a simple game of "hold the ball in the air", so calling them "soccer balls" is an overstatement at best.
Good thing THAT particular sport didn't evolve or we would still be playing soccer with balloons. When someone, somewhere had the idea to use stuffed leather in order to create a kicking object, we could very well state that it meant the start of a new era in the history of soccer balls and the soccer game.
Leather balls were harder, more controllable and more durable, although not as elastic as the rubber balls used in the Americas. However one of the biggest problems of that period's soccer balls, be they made of leather, rubber or bladder, was that they were highly irregular in shape and size, which made them less controllable.
