Originally Posted by GTcommuter
Yes, thank you for directing the conversation back to light weight touring.
The jacket that I'm using is a Rainshield O2. The material is very thin like Tyvek. I had concerns about durability but bought one at the start of last summer. It's been on several trips and lived in my saddle bag the rest of the time for commuting. I don't wear it continuously, just when it rains or gets unexpectedly cold. So far it's held up, but I've seen others patched up with tape. I'm not very worried about it's durability.
I had an O2 rainjacket. The material is pretty soft and is easily damaged. For riding on a bike, it works fine, but you wouldn't want to wear it while walking through brush, say between the road and a stealth campsite. Also, after a while, the outer layer will separate from the inner layer. Nothing lasts forever, but I didn't think it was durable enough.