The 2021 Topps Big League Baseball Fat Packs contain 72 standard-size trading cards featuring Major League Baseball players, with a focus on the MLB World Series. Each pack includes 2 Orange Parallels cards with labeled or sticker autographs from players like Mike Trout. These sealed packs offer collectors a chance to find autographed cards, rookie cards, limited editions, and exclusive inserts from the 2021 season, making them a valuable addition to any baseball card collection.