Flying Insects in Pop Up Camper?

What kind of insects are you talking about? If they are mosquitoes, there are wonderful things produced by Off -- lanterns and repellents and the gadgets you wear on your belt. Some of these also are effective for flies. If you are talking of large flies, perhaps a swatter is all that is needed. The coils covered with sticky stuff are quite unsightly, but work quite well for flies if you have a terrible influx of them. You hang them from the roof of an enclosed area. They are an oldfashioned remedy, but they work. The coils that you burn are good, but do not use them in an enclosed space.

Burn them outside to keep insects away from the entrance, so the bugs don't follow you inside. Another thing that is very useful is a Thermocell. It is very portable. I use that outside when I am sitting by a campfire or doing en plein air painting in the bush. I do not think those should be used in an enclosed space either. Most home remedies are very ineffective if the bugs are bad. If stuff like listerine sprayed around actually worked, the Off company wouldn't keep developing other products to sell to us.