Wow! Sounds like the MEC Scout Tarp is a good choice.
I am curious how much smaller the Silicone version packs?
Sadly when I had visited MEC on Tuesday all the MEC Scout a Guide (the larger version) were sold out so I was not able to see for myself how it looked and felt. Thank you for the photos.
I guess shaving 1.5lbs would be nice but I really want to pack smaller - my Gortex bivy is pretty big but I am not willing to use any other material.