2026 Topps Series 1 Baseball Celebration Mega Box Upper Deck Base Set - Green Parallel

Base Set - Green Parallel Cards

and you only need to learn one set of rules

256 Malaki Starks

Base Set – Orange Dots Parallel #’d to 399

Also keep an eye out for 1-of-1 Gold parallel Horizontal Variations

2026 Topps Series 1 Baseball Celebration Mega Box Upper Deck Base Set - Green ParallelConfiguration: 14 Packs Per Box, 14 Cards Per Pack Each Box contains 1 Base Card Opening Day Parallel and at least 7 Base Card Confetti Parallels, on average! The 2026 Topps Series 1 Baseball Celebration Mega Box arrives just in time for MLB Opening Day, building on the flagship release and continuing the celebration of 75 Years of Topps Baseball. Celebration delivers the 350 card Series 1 base set, featuring today's biggest stars, top rookies, Future