A typical pre-concert checklist includes a clear bag and one portable charger. Even for non-influencers, a battery pack is essential for capturing every potentially viral moment of the show. Recent tours have proven there’s plenty to get on camera: Beyoncé has the “everybody on mute” challenge, Charli XCX has the “Apple” dance, Taylor Swift has the “22” hat giveaway, and Sabrina Carpenter has the “Juno” pose.