I'm not much for disposable items, but I really like these. They have saved me a lot of time, effort and stress since my daughter was born.
These pads made by Munchkin are thick, disposable pads that you can throw down anywhere when your baby needs a diaper change. They make the area sanitary for your baby and for anyone else who comes along later. I don't use them all the time. When I'm somewhere I know well or am not in a hurry, I usually just carry the plastic changing pad from her diaper bag and then clean it when I am finished. But sometimes you want more.
When I was flying alone with my daughter, these were especially useful. They don't take up much room, so you can always carry a few. Those bathrooms at the airport often have either really nasty looking changing tables or no changing table at all. Sometimes I was forced to change my daughter at the counter where people brush their hair and apply makeup. These pads made it so much more comfortable for her. When I was done changing her, I just balled them up and tossed them into the trash with the diaper.