Can Bags of Water Repel Flies?

Can Bags of Water Repel Flies?

Bags of Water to Repel Flies: Truth You may have seen water hanging in a clear bag on a porch or outside of a restaurant. Did you know there is evidence that the bag can repel flies? It’s not the water itself or the plastic bag that make it effective – the trick works when light reflects on the water inside the bag. This confuses flies so they stay away from the area, although it will not completely eliminate flies.