My husband likes to leave his Corona bottles outside. The central Texas flies seem to be more drawn to it than the dog food. Of course, one of the reasons we have so many damn flies is because of the dog. Fecal matter in the yard doesn’t help the problem but the empty Corona bottle sure gives the flies a delicious place to hang out until they drop dead. Never tried the bag method but I’m ready to try anything to keep the disease carrying pests away.