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 on airplane and boat to collect and contain vomit in the event of motion sickness.. Bringing private disposable sickness bags is a good way for pregnant women with morning sickness and for travelers who know they are prone to sickness. Sickness bags used to be 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.