The Harry Potter Cauldron Mug is quite possibly the coolest mug in existence. Not only can you fill it with almost half a litre of your favourite bevvy, but you could use it for your spells - because you go to Hogwarts, right? You can grab it on sale at Catch for $24.99.
This spectacular mug is definitely going to be the envy of the office or house, and if it were mine (which it shall be), I wouldn't let anyone touch it!
It's dishwasher and microwave safe (great for heating up your veggie soup for lunch), and it has a handy lid for keeping your potions contained.
It's a decent size, this one, measuring around 11 centimetres in each direction, and holding 473 millilitres.
Want it, need it, must have it.
There are quite a few Potter-themed mugs around, but this is a hands-down fave.
Standard postage starts at $6.95 at Catch.