No Kidding on this one,How about a Military Body bag?They are usually as tough as nails,Rip-stop waterproof Nylon with Very Heavy-Duty Zippers,Some even come with Strap handles,of which you could incorporate in your rigging,so as to sleep suspended if you had to,& They come in many different sizes as well,& The Best part,Very Affordable!Just don't eat any Beans,otherwise the intended use of such may fall to it's primary purpose,lol! Throw in a Lightweight Poncho liner,& I'd think you&yours will be Well off!