Hacky sack
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Hacky Sack is the trademarked name of a type of footbag. The name "hacky sack" came from the inventors of the footbag, John Stalberger and Mike Marshall. Marshall suffered a fatal heart attack in 1975, however Stalberger continued the business. At a later date, Stalberger sold the title to Wham-O. The name Hacky Sack has become a genericized trademark.
Circle Kicking
Hacky Sack is sometimes also referred to as Circle Kicking. There is a formal game of footbag but Circle Kicking is played informally, with little or no rules. Circle Kicking generally consists of a group of people formed in a circle, trying to keep the footbag in the air. Usually the goal of the game is to complete a "hack". A "hack" is when the footbag is passed around and touched by every player in the circle, without touching the ground. Many players feel the game is based on respect and fun, so someone showing off and kicking to yourself is generally frowned upon.
Other games are also played, for example, waterfall, elimination, kill, step up and tower.