Topps 2026 MLB Baseball Series 1 Mega Box

2026 Topps Series 1 Baseball Mega Box begins a year-long celebration of the 75th Anniversary of Topps Baseball. Built on the 2026 design, it includes 14 packs per box and 14 cards per pack, a 350-card Base Set, anniversary inserts and parallels, plus autographs and relic cards.