Exped BivyBag Duo Emergency Bivy Bag functions as a bivy bag for two. Three floor vents prevent the accumulation of excess condensation. Use as a comfort station in rough weather or night sack in rock and ice. Top corner vents can be attached to rocks, trees or other secure items. There's even a peephole in Duo's center.
Use as a poncho.
Silicone coated ripstop nylon is lightweight and waterproof.
Thread is nylon core with a cotton mantle that expands when wet. Exped developed a new tunnel seam to prevent the stitch holes from becoming exposed if strained.