I'm worried about not having a zip though, it's one of the things I appreciated most when I slept out during a cold night, once you've adjusted all the drawcords of the sleeping bag, finally managed to tighten everything up around your face, just be able to get in and out by undoing the velcro of my sleeping bag collar and unzipping it's zip and the bivvy bag's. Having to untighten the hood of the bivvy and pull yourself out (rather than just sitting up through the much larger opening of with a zip).
Otherwise, does the hood close well?