hey guys, i love versatility, and i was thinking about how to make a bivy sack more versitle, i mean heck you only use it for sleeping on the ground. so i was thinking, what would it take to make a bivy that would be able to protect you under a tarp on the ground , and yet when the urge arrises or campsites are sub par, you could hang it like a hammock. mind you ive only slept in a backyard rope hammock, so im curious if this would work. just picture a square peice of waterproof fabric about 30- 35" wide and i dunno 100" long. at both narrow ends (30/35" wide ends) have a nylon sleeve to hold 1 trekking pole in each sleeve. (acting like spread bars/attachment points) and then attach some rope to the trekking poles. i currently weigh 150 pounds, and im 6 feet tall. my trekking poles are pretty sturdy carbon fiber poles, and since they dont need to extend much to reach 35" i think they will be sturdy enough. for the top of the bivy, just have some light weight 1.1 oz dwr and a vent in the footbox. have a generious proportion zipper for venting/ease of entry, and a no-seeum area for the face. what kind of fabric would everyone recomend for the bottom? seatle fabrics has some 70 denier 1.9 oz silynlon with a tear strength of 16-18 pounds, would this be strong enough? anyway, just wanted to see peoples thoughts before i spend some time and money, but if it does work... could be mighty comfortable for an AT thru-hike.