Don't struggle with impractical travel mugs when you can drink your coffee from this 12 Ounce Flip and Sip Insulated Engraved Mug. This mug is perfect for taking hot and cold beverages with you no matter where you go, and features a funny engraved saying right on the mug. It's designed with a special double-wall vacuum insulation that keeps drinks hot for 4+ hours or cold for 20+ hours. Plus, it's designed for simple one-handed operation, so you can flip back the cover and press the button to sip all with one hand! A leak-proof lid prevents any nasty spills while you're on the go, and is dishwasher safe for easy cleaning. The mug is also compatible with single-serve systems.