How big are hacky sacks?

Hacky sacks, also known as footbags, typically have a diameter of about 2.5 to 3 inches (6.4 to 7.6 cm) and weigh around 4 to 5 ounces (113 to 142 grams). They are usually filled with plastic pellets or sand and are designed to be kicked and controlled with the feet. The size and weight make them easy to handle for various tricks and games.