Curious if anyone has created a bug bivy with built in tyvek ground sheet. this way you have the perfect amount of Tyvek for your bivy and eliminate the extra piece of equipment in your bag floating around. Can mesh be sewn to the Tyvek as well? if anyone has one of these or has attempted to make one, i would be interested to hear your experience.

Pretty sure you can sew noseeum right to the tyvek. Plenty of people have made bivies entirely from tyvek. I dont see any reason you shouldn't be able to make one with a tyvek floor.

http://www.backpackinglight.com/cgi-bin/backpackinglight/search.html?q=tyvek+bivy&x=0&y=0