The Set of 2 Smart Tubes™, are perfect for creating and transporting travel size quantities of personal care products, beverages, and condiments. Simply fill and go. Each Smart Tube™ is leak-proof and spill-proof. Made from PBA free, food-grade silicone. Great for travel, sporting events and outdoor use. Each tube holds 3 ounces (89 ml) of liquids so they are 3-1-1 carry-on compliant.