"Hacky Sack." YourDictionary, n.d. Web. 15 October 2018. <http://www.yourdictionary.com/hacky-sack>.
Hacky Sack. (n.d.). Retrieved October 15th, 2018, from http://www.yourdictionary.com/hacky-sack
From the trademarked "Hacky Sack"
(plural hacky sacks)
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