I’ve never used one but I would love to have one in case I’m driving in the middle of nowhere and really have to go. It’s happened before.
TMI!!!
http://www.amazon.com/s/ref=nb_sb_ss_i_0_11?url=search-alias%3Daps&field-keywords=women%27s+pee+funnel&sprefix=women%27s+pee%2Caps%2C150