Answer
Two first-round draft picks were traded for Khalil Mack in 2018. The Chicago Bears acquired Mack from the Oakland Raiders in exchange for a 2019 first-round pick (No. 24 overall) and a 2020 first-round pick (No. 26 overall). Mack, a three-time Pro Bowler and two-time All-Pro, had been a key part of the Raiders' defense since being drafted fifth overall in 2014.