I'd have to say that those are pretty cool... maybe unique is a good word. I do suggest you don't use Walmart plastic bags as they all have a hole in them.
I keep a cup in my work vehicle. Works well as long as there aren't any passengers. I recommend that you empty the cup immediately. They tip over and make a mess. I had one guy get in my vehicle and say it smelled like "pee".... I made some lame excuse, but I knew the truth. Gave it a very good cleaning when I got home.
