Okay, (probably) stupid question. I'm going to start winter backpacking and I have an Oware 8x8x5 pyramid. It has no top vent of any kind, and doesn't have a two-way zipper so I can't vent that way either. In camping in the snow, assuming there is a lot of spindrift and I've sealed off the tarp bottoms with snow, am i in danger of suffocation? It seems that pyramids in winter storm setup would need a top vent, but thought I would ask.
Also, apart from using bivies, does anyone use tarp type winter shelters with some sort of footprint?
I'm trying to avoid buying a new winter shelter (I have a Bibler Eldorado, but it's not big enough for 2 + dog).
