Made of approximately 14 plastic store bags, three of which were of the thin, translucent variety. It might have been 12 plastic store bags. I smushed and twisted as in the making of the regulation-size Sacky Sack. Actually, it was more of a smush, stuff, twist, turn inside out, twist kind of thing. All I know is that it god so big that I could get each of the handles of the outside sack to just—-barely——–fit around the whole Sacky. A couple of the inner sacks seemed to have had some air trapped in them, which gave the Super Sacky a nice extra bounce to complement its round, firm, and smoothly packed softball-sized self. It is very cool, and fun, too.