http://picasaweb.google.com/Martian74/P ... 8307600802
Here is the sail folded down, it only weighs a couple of hundred grams.
http://picasaweb.google.com/Martian74/P ... 9335839314
Here is a little vid of me sailing with it, it was my first day out with the sail & I am much better now

http://picasaweb.google.com/Martian74/P ... 9570705538
Here I am out on the water after paddling out in the bay but not enough wind for the sail.
http://picasaweb.google.com/Martian74/P ... 1395256578