Mighty Mug is powered by our innovative and patented Smartgrip Technology. Simply place Mighty Mug down on your desk and it creates a powerful airlock which allows Mighty Mug to resist accidental knocks to help avoid spills. When you lift Mighty Mug the pressure is instantly normalized allowing the airlock to release and Mighty Mug to lift naturally. You need to try it to believe it.• Mighty Mug Solo Travel Mug is ideal for all single serve enthusiasts. • Smartgrip Technology keeps mug upright to avoid spills and leaks during travel. • Fits perfectly under most single serve coffee machines. • Car cup holder friendly. • Made of double wall plastic. • Dishwasher safe. • BPA Free. • Capacity: 11 oz.