Because "Trick or Treat" is one of the main Halloween activities. Children dressed up as ghosts, ring the neighbor’s doorbell door by door, yelling "Trick or Treat!" Just trick or treat!"), the host (maybe also wearing a horror costume) will bring out some candies, chocolates or small gifts, and some people will even give some change. At this time, you need to use the Halloween candy bag to hold the candy, and then the whole bag is moved home!