The BLU-82B or Daisy Cutter is the largest conventional bomb in existence and is 17 feet long and 5 feet in diameter, about the size of a Volkswagen Beetle but much heavier. It contains 12,600 pounds of GX slurry (ammonium nitrate, aluminum powder, and polystyrene), and is so bulky that it cannot even be launched in a conventional method. To put that in context, the ammonium nitrate in just one Daisy Cutter bomb is about six times the amount used in the bombing of the federal building in Oklahoma City. Although the blast from this bomb is extremely lethal, it still has less than a thousandth the destructive power of the atomic bomb used on Hiroshima.
Daisy Cutters were used in Viet Nam to create instant helicopter LZs in the jungle. Made a mess of anyone standing nearby, too.