I've seen a lightweight poncho that claims to be 100 per cent waterproof US military issue on Amazon: http://www.amazon.co.uk/s?ie=UTF8&search-type=ss&index=sports&field-keywords=Military 1st Lots of camo styles and has poppers and is a good size for an emergency tarp. It's also a good price. So far so good... BUT! If I was in a trudging along in a downpour would it be waterproof? Is I thought ripstop nylon was water resistant only. And do you reckon it's US military kit or a copy? I'm guessing the latter.