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2026 Topps Series 1 Baseball Celebration Mega Box Checklist, Team Set Lists and Details

2026 Baseball Cards, Checklists, Checklists-New, New
By Andrew Harner - March 4, 2026
March 4, 2026
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Jump to the 2026 Topps Series 1 Baseball Celebration Mega Box checklist and team set lists

Collectors will feel like they’re partying when opening 2026 Topps Series 1 Celebration mega boxes.

Between the Confetti parallels and mascots making character appearances, Celebration mega boxes help make the unofficial start to baseball season a little more fun.

Boxes include the chance to find exclusive parallels and inserts, and mascot autographs and relics.

2026 Topps Series 1 Baseball Celebration Mega Box Checklist Overview

The Celebration mega boxes are an overlap of 2026 Topps Series 1, but collectors can find several concepts in these boxes that aren’t available anywhere else mixed in with concepts that have been inserted across other formats.

Confetti parallels are one of the most notable exclusives. Found in regular Confetti, as well as Pink and Lime Green, collectors should land several of these in every box.

Topps also pays tribute to the long-running Opening Day brand, which was an annual staple from 1998 to 2022 that targeted younger collectors and often included similar content as the Celebration mega boxes.

The Opening Day Foil parallel includes a repeating pattern of the MLB Opening Day logo running across the cards and land once per box.

Also making a return exclusively to Celebration boxes are mascots.

Topps has a lengthy history of producing mascot cards, mostly in the Opening Day line, and collectors can collect all the mascots that make them laugh or do a face palm through a comprehensive insert.

Speaking of mascots, they also have some of the rarest cards in the product.

Mascot Dynasty Autographed Patches make their return to Celebration boxes, giving collectors a prime piece of mascot-worn memorabilia and an autograph.

Exclusive variations include Dugout Peeks and Walk This Way.

Dugout Peeks are exactly how they sound — a peek at a player in the dugout, with a pair of cartoon eyes peeking back at you for good measure.

Walk This Way takes a look back at several players who secured walk-off wins throughout the previous season.

Gameday Drip is also making a second straight appearance in Celebration mega boxes, giving collectors a look at some of the styles players have as they enter a stadium.

Additional inserts exclusive to Celebration boxes are 8 Bit Ballers and Perennial All-Stars.

2026 Topps Series 1 Baseball Celebration Mega Box baseball cards at a glance:

Cards per pack: Mega – 14
Packs per box: Mega – 14
Boxes per case: Mega – 20
Set size: 350 cards
Release date (subject to change): March 26, 2026

Shop for 2026 Topps Series 1 Baseball Celebration mega boxes:

  • Celebration Mega Boxes — eBay

Shop for past years’ Topps Series 1 Baseball Celebration mega boxes on eBay:

Shop for other 2026 Topps Series 1 Baseball formats:

What to expect in a Celebration mega box:

  • Opening Day Foil Parallel – 1
  • Confetti Parallels – At Least 7
  • Exclusive Inserts/Variations – 28 Total

2026 Topps Series 1 Baseball Celebration Mega Box Checklist

You can also download a customizable spreadsheet copy of the checklist:

Please note that print runs for cards without serial numbers have not been announced.

Additional inserts and parallels from 2026 Topps Series 1 Baseball have been inserted into the Celebration mega boxes. This checklist only reflects content exclusive to Celebration mega boxes.

Base
Variations
Autographs
Memorabilia

2026 Topps Series 1 Baseball Celebration Mega Box Checklist – Memorabilia Cards

Mascot Relics

21 cards
Parallels

  • Green /99
  • Gold /50
  • Orange /25
  • Black /10
  • Red /5
  • Foilfractor /1

MAS-ATH Mascot, Athletics
MAS-BBR Bernie Brewer, Milwaukee Brewers
MAS-BLO Blooper, Atlanta Braves
MAS-BX Baxter, Arizona Diamondbacks
MAS-CAP Rangers Captain, Texas Rangers
MAS-CLK Clark, Chicago Cubs
MAS-CWS Mascot, Chicago White Sox
MAS-DIN Dinger, Colorado Rockies
MAS-MOS Mariner Moose, Seattle Mariners
MAS-MRM Mr. Met, New York Mets
MAS-MRR Mr. Red, Cincinnati Reds
MAS-MRS Mrs. Met, New York Mets
MAS-ORB Orbit, Houston Astros
MAS-PAW Paws, Detroit Tigers
MAS-PIR Pirate Parrot, Pittsburgh Pirates
MAS-RAY Raymond, Tampa Bay Rays
MAS-ROS Rosie Red, Cincinnati Reds
MAS-SCR Screech, Washington Nationals
MAS-SLG Sluggerrr, Kansas City Royals
MAS-TCB T.C. Bear, Minnesota Twins
MAS-WGM Wally the Green Monster, Boston Red Sox

Checklist Top

Inserts
Full Checklist
Team Sets

Related products:

Recent Topps Series 1 Celebration Mega Box releases:

Protect Your Collection With:

Tags2026 Topps Series 1 Baseball2026 Topps Series 1 Baseball Celebration Mega BoxTopps Baseball
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Andrew Harner

Andrew was surrounded by trading cards during adolescence. A lifelong, second-generation collector, he maintains a sizable Tim Salmon collection and has previously published written work with Sports Illustrated, Fanatics, and the Society for American Baseball Research.

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