The Sipa Sipa® footbag (hacky sack) is hand-crocheted in brightly colored rayon thread for durability and high visibility. Sipa Sipa® footbags with larger plastic bead filler are fully washable, and they produce their own unique sound. The Sipa Sipa®was the first mass-produced crocheted footbag introduced to the world in 1983. The Sipa Sipa® is endorsed and used by Guinness World Record holder, Andy Linder. The Sipa Sipa® is often imitated, but never duplicated.