14 packs per box, 14 cards per pack.

Box Break:
- 1 Base Card Opening Day Parallel
- 7 Or More Base Card Confetti Parallels

PRODUCT HIGHLIGHTS
- 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 Stars, League Leaders, and team cards!
- Collectors can look for 75th anniversary-themed inserts and parallels that honor the brand’s rich history and legacy in the Hobby!
- The Celebration Mega Box adds exclusive base card parallels and inserts. Returning favorites include Dugout Peeks, Walk this Way, and Gameday Drip, alongside trading cards highlighting team mascots!
- Autographs and relics remain a cornerstone of the experience, delivering the hits collectors expect from Topps Baseball!