For full length bug protection, you might want to consider the Mountain Laurel Designs Bug Bivy:
At 5.3 oz, it is really light weight.
I don't own this myself, but I am considering it.
Just this year, I am experimenting with using a MLD Poncho Tarp and MLD Soul Side Zip Bivy.
Depending on if I have problems with bugs, I think that this would be a logical addition to my setup.
Hope this helps.