The 2026 Topps Series 1 Baseball Flagship Collection Costco Super Box is a sealed box containing baseball trading cards. This set features cards of Major League Baseball players, including Shohei Ohtani, from teams like the New York Yankees and Los Angeles Dodgers. Each card is made of high-quality card stock and is autographed by the player using a hard-signed format. The box is part of the Topps manufacturer's collection and is authenticated by Topps, making it a desirable item for baseball card collectors.