>>1042150If you're gonna be in a bivy, I would have a smaller tarp- or just use a poncho. It's overkill, so it doesn't really matter. Just a little more tarp to fuss with and not as multifunctional.
I would try just the tarp and a groundsheet. I have a big groundsheet that has tie outs that I tie to the corners of the tarp to tension it, effectively making a bathtub bottom.
If you're looking at bivies, and especially if you're trying this out and don't wanna drop a ton of money without knowing if it's for you I'd look into the USGI modular sleep system bivy. Or you could try making your own out of tyvek,
