Packing shampoo for your trip is always an iffy proposition. Anyone who has flown before knows that taking liquids on a plane can often result in a huge mess in your suitcase. Pressurized air inside planes can cause shampoo, lotion, and other toiletries to explode, leaving a gross, goopy puddle in your luggage. Fortunately, the video below shows how to pack liquids for flying—all you’ll need is plastic wrap.

Video: Andy Seifert, Groupon. Demonstration: Molly Metzig, Groupon.