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I have used insect netting in conjunction with a tarp. It is my opinion that tarps such as
this with sewn on attached netting are the most efficient in terms of weight, bulk and ease of use. However, if you desire the ability to separate the tarp from the netting you have several options. I don't know your budget or other requirements but would suggest that you suspend a box net under your tarp, such as
this or
this . If you prefer to attach netting without a ceiling then I suggest constructing the netting so that it attaches similar to
this .