Size
There's no better way to enjoy a cup of tea or coffee in the great outdoors than with Petromax 's MAIL MUG.
It's made from a material that combines glass and steel, making it sturdy and easy to clean. Light as a feather, it'll accompany you on all your outings or hikes, and hangs securely from your backpack.
And don't forget to take it with you to the office to make others jealous.