This is NOT 'hacky sack', this is Footbag Freestyle! Hacky sack is a group activity involving kicking the bag in an effort to keep it off the ground. Footbag freestyle is an international sport sanctioned by the IFPA (International Footbag Players Association) and recognized for its creativity and advanced eye/foot coordination.
Hacky sack is a trademarked product of Wham-O. Footbags are mostly hand-made by professionals in the sport.
The web is full of articles and videos that demonstrate just what makes footbag freestyle so different from hacky sack. Check out all the information listed in the Footbag Menu.
There are many varieties of footbags available. For more information about footbag, visit: http://www.footbag.org