24 packs – 12 cards per pack. The 2017 Topps Series 2 Baseball HTA Jumbo Hobby Box is a sports trading card set from the Major League Baseball produced by Topps. This box is part of the Modern era (1981-Now) and contains original trading cards. It is a product manufactured by Topps in the United States for the 2017 season. The box is configured as a jumbo hobby box, specifically designed for collectors and enthusiasts of baseball trading cards.