A footbag is a small, round bag usually filled with plastic pellets or sand, which is kicked into the air as part of a competitive game or as a display of dexterity. "Hacky Sack" is the name of a brand of footbag popular in the 1970s, which has since become a generic trademark.
A crocheted footbag
Hacky Attack playing field
The most successful footbag doubles team, multiple world champions and innovators Martin Sladek and Tomas Tucek
Eric Wulff executing a Roll spike at the 2008 Green Cup, San Francisco
Wham-O Inc. is an American toy company based in Carson, California, United States. It is known for creating and marketing many popular toys for nearly 70 years, including the Hula hoop, Frisbee, Slip 'N Slide, Super Ball, Trac-Ball, Silly String, Hacky sack, Wham-O Bird Ornithopter and Boogie Board, many of which have become genericized trademarks.
Wham-O headquarters in Carson, California
A Frisbee made by Wham-O
Vintage Blue and white Wham-O Magic Window toy from the 1970s
Frisbee political campaign advertisement designed by San Francisco-based advertising executive Bob Gardner of Gardner Communications as part of U.S. President Gerald Ford's 1976 advertising team and given to Ford at the 1976 Republican National Convention. At the time, Gardner's company also held the Frisbee advertising account.