*New In Box Price Firm* Description Included in Owlcrate's June 2018 box for summer, this is an exclusive mason jar mug (with a screw-on lid at the top to prevent spillage while traveling) created for Owlcrate. Perfect for any bookworms who like to travel! Dishwasher and microwave safe. This mug is completely new and unused, kept safely inside its box in my cabinet.