Weight of poncho without stuff sac or mods = 251 grams or 8.85 oz.
Stuff sac = 10 grams or 0.35 oz
Modification adds 10 grams or 0.35 oz.
Ziplock bag = 12 grams or .42 oz.
My poncho (without stuff sack) with mods + zip lock = 273 grams or 9.62 oz.
So for less than 10 oz you have a highly versatile piece of gear that just takes some care. I like it!
By the way, Pan talks about the mods
in the video section of HF, for DIYers that want to do the mods themselves.