Take catching flies to the MAX. The RESCUE! Fly Trap Max is our biggest fly trap yet. It comes with one water-soluble lure 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 green top cap and drown in the water. Refills for the Fly Trap Max are sold in single-use pouches, allowing the trap to be reused over and over.