The dimentions are 30" by 90" so it is big enough for sleeping pad plus some gear. It is made from .74oz cuben which is very strong and light.
I can't remember the exact weight but it was between 120-150 grams, very light.
You can see pictures here of the bathtub floors in SilNylon:
http://bearpawwd.com/shelters_floors/bathtub_floor.html
I used it under a pyramid tarp and it is really easy to set up- just stake the 4 corners
![Smile :)](./images/smilies/icon_smile.gif)
Looking for $150 including express postage anywhere in Australia