8 Best Glass Coffee Mugs, Tested and Reviewed Coffee Mug Warmer Pad Cup Heater Coaster Constant Temperature Heating USB Electric Mug Mat Set Milk Tea Water Home Office Gift White Gift Set USB theheavycup sent me this and honestly this is actually the worlds heaviest mug. This Mfer is actually heavy as hell. Like actually. If you want a heavy mugwelp. This is it U67 16 Ounce Solid Gloss Color Funnel Mug Universal Printing Car Heating Cup with Built in Mug 12V24V Universal Auto Heating and Thermal Insulation, 1500ml capacity: Large size for extended use., Auto heating: Keeps drinks warm while driving., Built in mug: Brew To A Tea Double Wall Glass Coffee Mugs, 16 oz, Set of 4, Clear, Brew to a Tea