The fly trap is made from used soft drink bottles and post-consumer plastic for minimal impact on the environment. The fly trap comes with one packet of water-soluble attractant packaged inside a foil pouch. just empty the contents of the foil pouch into the trap and add water. lured by the scent, flies enter through the yellow top cap and drown in the water. Attractant refills are sold in single use pouches, allowing the trap to be reused over and over.