For extra protection from leaks and random searches use these ShampBooze and Umbrella Flask lid safety seals. They are one more barrier from the security finding out what's really inside your "shampoo" bottle. Comes with 6 seals so you can use them with your ShampBooze bottles 3 separate times or 6 times with your Umbrella Flask. Just simply push one in your bottle lid, writing towards the lid top, and screw on tight. The seals are pressure sensitive so that they will stick to the opening of your bottle tight. The adhesive is built into the foam and is released when you screw the lid tight. The adhesive will need an hour or so to set for a leak and smell proof seal. When ready to open, unscrew the lid and peel off the seal and enjoy. Using the seals along with ShampBooze saves the average cruiser over $180 off their cruise bar tab. It's simply the best way to sneak alcohol/booze onto a cruise.