There I was, on my way to work, and it started to rain. No biggie, happens all the time.
Then, low and behold, I see another biker. Not sure if it was Glad or Hefty, but it was a first time sight for me. The guy was using a garbage bag for a makeshift rain jacket. Looked like he just slit a hole in the bottom and sides for his head and arms. I'm not sure how well it worked, but I suppose it would help to some degree.
Personally, I'll just keep my nylon rainshell folded up neatly on top of my trunk bag. Quick, compact, easily accessible, and I don't have to throw it away after using it. Also, I won't need Tom Bosley telling me to "Get GLAD!!!".