Bubba Keg 20oz Travel Mug Raspberry Your Bubba Keg comes fully equipped 22 oz capacity with Bubba FAT dual wall insulation for long-lasting icy coldness. Keeps hot items hot for up to 3 hours! Cold items cold for up to 12 hours! Because Bubba KEGs have a genuine stainless steel band around the outside, they are not microwave safe. However, Bubbas dual-wall insulation keeps food and beverages hot for longer than most beverage containers and beverages/foods may not require re-heating. WARNING: Hot beverages held if this cup could cause injuries care should be taken to prevent injury. Do not use in microwave or clean in dishwasher.