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RELEASE HIGHLIGHTS
Box Contents: 20 packs per box – 8 cards per pack
Top Highlights: 1 Autograph or Relic per Hobby box
-2026 Topps Series 1 Baseball Celebration Mega Box is a special-edition release timed for MLB® Opening Day (March 26) that celebrates both the annual Series 1 launch and the 75th anniversary of Topps Baseball.
-Collectors can build the 350-card Series 1 base set (veterans, rookies, stars, legends, Future Stars, League Leaders, and team cards) while chasing exclusive parallels and insert content such as Walk This Way, Gameday Drip, Mascots, and more.
-Chase MLB Mascots Dynasty Patch Autos featuring game-used jerseys, numbered to 10. Additionally, look for Dual Patch Auto cards featuring Mr. and Mrs. Met, and Mr. Red and Rosie Red, numbered to five. 1-of-1 Mascots Dynasty MLB Logo Patch Auto cards are also there for the chase.
Click here for product info from Topps
Click here for the 2026 Topps Heritage Baseball checklist