The hottest new trend for Gen Z: hacky sacks Senior Correspondent covering technology and culture Hacky sack, the Gen X campus staple, is making a comeback with Gen Z. Lori Van Buren/Albany Times Union via Getty Images Hacky sacks are the hot new trend sweeping high schools this spring. Teens are starting clubs at school and making ironic social media pages about their new hobby. The sudden fad started just a few weeks ago, and the footbags are sold out in many places. To anyone over age 35, what I'm able to tell you may feel unsettling and confusing: Hacky sacks are back in a big way with Gen Z. Across high school cafeterias, playing fields, and college quads, small groups of mostly men are gathering in circles to kick around a small, bean-bag-like sphere best associated with college campuses in the 1990s. Something happened just in the last few weeks — about when the air started to warm: Suddenly, high school students went all in on the footbag.…