An air sickness bag (also known as a barf bag, airsick bag, sick bag, or motion sickness bag) is a bag commonly provided to passengers onboard airplanes and boats to collect and contain vomit in the event of motion sickness. Hovercraft-ferry operators and even train companies have also been known to supply vomit bags. Pregnant women with morning sickness and travelers who know they are prone to be sick will sometimes bring their own disposable bags. Previously bags had been made from waxed paper or card. Modern bags are still mainly made from plastic-lined paper but significant proportions (mainly from Latin America) are made completely out of plastic.