LOL yup. read about using them right here on BF many years ago. whenever I stay at a hotel, I take home the shower cap. they last a long time. easy to stuff in a pocket. easy to whip off if the rain stops or you need venting. because they are clear any reflective bits on the helmet still shine through. they also offer some protection from the wind, but if it's cold they don't substitute for a thin thermal layer. sadly, motels are offering these less often. I guess you can buy them somewhere