The flask is made of 18/8 stainless steel, making for a solid structure that remains odorless and tasteless through countless uses. A twist off lid reveals a wide-mouth opening, while an attached lanyard ensures that you never lose the cap and gives you an easy way to clip the flask to your bag. Entirely BPA free, protected with a rustproof finish, and featuring an engravable base for further customization, the Stanley Classic 8 oz Flask keeps your sauce secret and safe.