Take a look at the "Parcho" from Quest Outfitters as a possibility. It comes as a kit with all materials and pattern and needs to be sewn. But, the sewing is not difficult and the Parcho works better for me than any previous piece of rainwear that I've had. It combines the features of a poncho, a rain jacket and a pack cover. The Parcho keeps you and your pack dry and is not terribly prone to internal condensation. I also use it as a ground cloth with my Zpacks Solo with a mesh floor. My Parcho, cut for a lightweight pack, weighs 7 oz. The cost of a complete kit is $50.