I give the tarp thing a try and I can get this one http://www.rei.com/product/766381 from someone brand new for 20$ and thought, its needs seam sealed no problem, its 17 oz. not 21 I weighed it without the bag and thats not sooo bad for a test trip, but will it be big enough, 9 x 7 I'm not sure how much room I'll have when its pitched, hell I'm not even sure which way I should pitch it, I've seen a few different methods and I not sure which works good, please share your opinions.