Ive just tried my new MindShift Gear Ultralight Camera Cover
Quite impressed with its function and comfort, held off a light rain shower with no issue and Im sure it would be fine in sustained light rain too. Walked 5 miles with it this morning through fields and woods. I would heartily recommend for anyone wanting a lightweight cover for easy day trips, although Im not sure Id use it for rocky scrambles as theres little padding, but thats not why I bought it!
Heres a link to a US site with good photos / description -
https://www.thinktankphoto.com/products/ultralight-camera-cover-10
Theyre not easy to come by in the UK, I got mine new from ebay from Snapperstuff
The size 10 is more than enough for my Nikon D5100 with 35mm lens and hood, but I can also just squeeze in a 18-200mm lens without hood but it feels a bit ungainly - the size 20 fits cameras vertically which would be more suitable for larger lenses.
Post edited at 15:18