Not sure of your expectations or experiences using an emergency shelter, nor what contingency you might be planning for... but for your consideration... years ago I ditched my (never used) "emergency" tarp for a small (6oz) travel umbrella that rides on my day/wilderness pack belt. Instantly deployable any time. Rain, snow, wind, sun. Since making that choice I can't recall ever wishing for a tarp. Nope not once. Conversely I've worn out several umbrellas since then. My current umbrella is a brown and baby blue floral pattern by Eddie Bauer-- picked up at a yard sale. I'm not particular, but I wouldn't be without one.