Are you looking for a bivi bag or bothy bag? The only 2 man bivi bag I've heard of was the Outdoor Research Advanced Double Bivy from around 10 years ago, but I cannot find a link for the product now. But here are some alternatives, which might be a little more practical especially if the kit is to be used for mountaineering purposes. I would forget about anything that is not MVP for bivi bag especially for 2 people.

http://www.outdoorsmagic.com/product-reviews/outdoor-designs-race-raider---first-look/2011.html

or if you think you can fit two in, how about one of these;

http://www.surplusandoutdoors.com/shop/c...and-739298.html