2026 Topps Series 1 Baseball Celebration Mega Box

2026 Topps Series 1 Baseball Celebration Mega Box

14 Cards per Pack, 14 Packs per Box

Celebrate the start of a new MLB season with the 2026 Topps Series 1 Baseball Celebration Mega Box, released just in time for Opening Day and continuing the historic 75 Years of Topps Baseball anniversary celebration.

This special Mega Box edition features the complete 350-card Series 1 base set, showcasing the biggest stars in baseball, exciting rookies, Future Stars, League Leaders, and team cards from across the league. Collectors can chase a wide range of 75th anniversary-themed inserts and parallels that honor the legacy of Topps and its impact on the hobby.

The Celebration Mega Box also introduces exclusive Holo Foil parallels, along with additional Mega Box–exclusive inserts and chase content that make this release unique.

Fan-favorite insert sets return, including Dugout Peeks, Walk This Way, and Gameday Drip, while special cards highlighting team mascots bring even more personality and fun to the product.

Autograph and relic cards remain a key part of the chase, giving collectors the chance to pull premium hits featuring today’s stars and future legends.

Whether you're building the flagship set or chasing exclusive parallels and hits, the 2026 Topps Series 1 Celebration Mega Box delivers the excitement of Opening Day in every pack.