The Incredible Spill Not Guaranteed to turn heads and drop jaws! Perfect for boats, parties and restaurants Mug not included With the Spill Not, the liquid in the cups does not spill or slosh in the cup, and the cup doesn't slide when carried or swung around. This is because the loop handle is very flexible and cannot deliver a lateral acceleration to the cup, which is usually what makes beverages spill from an open container not tipped. DURABLE yet elegant hanging tray for a single open beverage that can be swung all around with an incredibly small risk of spilling.