The 2020 Topps Holiday MLB Baseball Sealed Mega Box is an exclusive Walmart release featuring oversized and standard-sized trading cards of Major League Baseball players like Luis Robert from the Chicago White Sox. This box includes a total of 107 cards made of card stock and metal materials, with a focus on rookie cards and parallel versions. The set is part of the Topps Holiday series for the 2020 season, offering collectors a unique and limited edition collection of baseball trading cards from a trusted manufacturer like Topps.