We sorta forgot about a garbage bag upstairs this past weekend and came to a house full of fruit flies. So for the past couple days, we’ve set up these traps. We wrapped saran wrap around a bowl with an orange inside. Then we poked a small hole in the top. They can sneak in, but can’t find their way out. I still don’t understand how they can’t get out, but they don’t. We’ve probably caught a couple hundred or so now. At this point though, I’m not sure if I’m just creating more flies with the traps… but at least they aren’t flying around the house now.