A krathong is traditionally a small floating container fashioned of leaves which is made to hold a small portion of goods like a traditional Thai dish (such as hor mok) or dessert. The traditional krathong used for floating at the festival are made from a slice of a banana tree trunk or a spider lily plant. Modern krathongs are more often made of bread or Styrofoam. A bread krathong will disintegrate after a few days and can be eaten by fish. Banana stalk krathongs are also biodegradable, but Styrofoam krathongs are increasingly banned, as they pollute rivers and oceans. A krathong is decorated with elaborately-folded banana leaves, three incense sticks, and a candle. A small coin is sometimes included as an offering to the river spirits.