-- Last Updated: Nov-01-12 7:44 AM EST --
Many years ago I used a Vietnam era military hammock. The netting opened large for a side entry, once in, it took a bit of fiddling to seal off. You would always have to spend several minutes squashing the mosquitoes and black flies that came in with you. When I graduated to the bottom entry of the Hennessy I experienced far fewer unwanted occupants in my sleeping chamber. Think of one of those magnetic self sealing slits on a patio screen door.
I second the insect excluding merits of the birth canal entry. One day I will modify my Hennessy to have both it and the zippered caesarean option.