If you have ever packed a bag with your shampoo, liquid bath soap, etc, you know you run the risk of spillage. That can mean not only a mess, but ruined clothing. An easy way to prevent this is to unscrew the cap place a small piece of Saran Wrap over the opening and then recapping. This will create a seal that should protect the bottles from leaking. If you REALLY want to be sure, you can then place the bottles in a zippered plastic bag for EXTRA precaution!