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 eco-friendly, food-grade silicone. Great for travel, sporting events and outdoor use. Each tube holds 2 ounces (60 ml)of liquids so they are 3-1-1 carry-on compliant.