All I have is a bathroom scale so it's probably not too accurate but it weighed in between 1 and 2lbs on that.
The stuff sack that came with is 30" long and 6" across when laid flat. But this seems to be oversized. After laying it out in my basement, I quickly folded it back up and was able to pack it down to 24" x 4" x 4".
I was also wondering how you would go about removing the grommets without ruining the tarp?