I don’t always spill liquids anymore. Maybe that is because I use mugs that stick to my hands or desk, big and heavy. My favorite is a small one I bought at Logan airport in Boston 1980’s. It’s a Nissan thermal mug, steel and vacuum insulated that was a cool design at that time. At $20 dollars in 1980, that was a buy I had to think about for a few seconds. The current one is big , twice the Nissan’s size and also steel, so it is evident I like steel mugs. They feel rugged and strong, less prone to tilting and spilling the cargo. IThis is a fair representation of the current.