The modern bivvy bag transports moisture outside. That is comfortable enough for me and works very well. That is the reason, why I use the Snugpack special Forces 1 Sleeping bag (1030 g) with the Snugpack special Forces bivvy bag (340g) and use the Defcon 5 poncho (350g) as a tarp in rainy weather. You get a condensation problem in the poncho - emergency bivvy bag. If you sleep in such a combination longer than 6 hours you will get a whet poncho liner or sleeping bag. Toss in some form of ground insulation and a quilt and you have a real shelter system rather than one working against you. I'd rather have a poncho and bivy over a poncho and liner given the choice. All in all I could see getting by for a night or two in fair weather, but the same could be said for a leaf litter bed. You'll have to pick between degrading the insulation each night spent out consecutively or blocking wind and trapping more body heat. Even in fair weather you will be trapping condensation on the liner if you cover it with the poncho. In this case condensation will be bad since your head will need to be tucked inside. If it rains you will be fighting to keep the bottom layer overlapped with the top or risk water pooling up at the ground level and soaking into the liner. If the idea is to fold the poncho and liner like a burrito so have is acting as a ground sheet and the other half as a waterproof barrier on top of the insulation, I wouldn't.
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