Mt Whitney Zone Forums General Discussion Tyvek - the best ground cloth?

Salty, do you happen to have a picture of that rain fly setup? I'd like to see it. Did you actually use it as a ground cloth too??

Here's a ZPacks.com link for Tyvek ground sheets:
Tyvek Ground Sheet

Tyvek is a bit on the heavy side compared to the garbage bag split in two that I use. I use a new one every trip, throw it away at the end. I'd need something stronger, like the Tyvek, if I were on a longer trip.