In early October, more than 5,000 fans of the cult grill Big Green Egg — affectionately dubbed EGGheads — descended upon Coolray Field, in the Atlanta suburb of Lawrenceville, for EGGtoberfest.

Now, a new collaboration between Miller Lite and the grill brand Big Green Egg is further formalizing this relationship. Dropping May 28, the Big Green Kegg is a quarter-barrel keg-size holder ...