Hacky sack

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.

[1] The most common game of footbag consists of two or more players standing in a circle and trying to keep the sack off the ground for as long as possible.

It is also similar to traditional Asian games of kicking the shuttlecock, known as jianzi, chapteh, đá cầu, and jegichagi.

Professional footbags are usually made out of the fabrics ultrasuede light, facile, or amaretta (a sub-brand of Clarino artificial leather[10]).

While these bags can last a long time with proper care, they are quite fragile relative to their more common crocheted cousins.

There are also several novelty products available, including glow in the dark, chain mail, and even flame retardant bags that can be set on fire and played with.

Shoes can be further modified for freestyle footbag by removing layers of fabric from the inside, outside, and toe surfaces.

Circle kicking is the most common game played with a footbag, and is often what people mean when they use the term "hacky sack".

Contacts are usually on the inside of the foot behind the opposite support leg (Clipper Stall) or on the toe, however, many inventive possibilities remain and are used to create an endless list of tricks.

Players can choreograph routines to music, alone or in pairs, executing difficult moves in sync with the music—the result is something like a cross between rhythmic gymnastics and figure skating.

The current freestyle world champion in singles category is Jan Weber, of Czech Republic.

This particular discipline, practiced mainly in Northern Italy, was founded in 2009 by some university students and consists in hitting the opponent with precise and spectacular shots, on the street or in public places.

In this game, footbag is commonly called Street Ball, due to its ability to play in the crowd.