Batman Uniform with Cape 20 oz. Jumbo Ceramic Mug 'I'm Batman!' Ok, I'm actually a mug. This Batman Uniform with Cape 20 oz. Jumbo Ceramic Mug features the Dark Knights classic outfit with a removable cape. This Caped Crusader can corral countless contents! Ceramic mug holds up to 20 ounces of liquid. Hand wash only. Not dishwasher safe. Do not microwave. Ages 14 and up.