100% LEAK-PROOF DESIGN: The specially designed caps have a special one-way valve that only allows liquid flow when the cap is open and pressure is applied. TSA APPROVED 3 OZ. CAPACITY: This set of 3 oz. bottles is TSA approved and will hold plenty of your favorite shampoo, body wash, conditioner, lotion, and other liquids. ADJUSTABLE LABELS & SUCTION PADS: The caps have preset labels “Shamp, Soap, Lotion, Cond, Sun”. Just remove the cap and twist to the desired setting. We’ve also added suction cups so they’ll stick to tile, glass, mirrors, and more so they’re always handy when you’re on the road. BPA-FREE BOTTLES ARE ALSO FOOD SAFE: Made from food-grade, BPA-free silicone so you can also fill these bottles with condiments, sauces, or any liquid you like. TRANSPORTATION SECURITY ADMINISTRATION (TSA) – APPROVED: Silicone bottles are below the 3.5 oz. / 100 ml restrictions from TSA.