Model: MUGBHP05 Stoneware 350 ML Slytherin crest Mug HARRY POTTER Mug Slytherin Crest. This Harry Potter mug is a great way to add a little fun to the home. It features the green and silver Slytherin crest on one side and the Hogwarts crest, which features all four houses, on the other. This mug comes in an open gift box. A perfect gift idea for a true Harry Potter fan.