The explosives used in the 2016 Central Park blast that left a teen without a foot were packed in a clear bakery bag, authorities revealed Tuesday, the two-year anniversary of the crime, as they asked for the public’s help in the case.

The bag — bearing the name “La Unica” and “Tropical Crackers” — was one of the pieces of evidence recovered from the Central Park scene, according to an ATF spokesman. There are currently no bakeries by that name in the city.

The NYPD and federal Bureau of Alcohol, Tobacco, Firearms and Explosives released a photo of the bag, along with the announcement of an up to $40,000 reward “for information regarding an explosion” at the park.

Connor Golden, a then-18-year-old college football player, was climbing on rocks near Fifth Avenue and East 60th Street with friends when he stepped on the explosives. His foot had to be amputated as a result.

“In all likelihood, there is at least one person who placed that there, and there is probably … more than one person who knows about it,” said NYPD Deputy Commissioner of Intelligence and Counterterrorism John Miller at an unrelated press conference. “We still call on them to come forward.”