Take catching flies to the MAX. The newest addition to our fly line is our biggest fly trap yet. The RESCUE! fly trap Max comes with one packet of water-soluble bait 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. Refills for the Fly Trap Max are sold in single-use pouches, allowing the trap to be reused over and over.