Fits Multiple Vessels: This flip lid comes in a variety of colors, and only fits on threaded Simple Modern vessels, including all sizes of the Classic, Scout, Journey and Lowball as well as the 24oz Trek. This lid does not fit the Simple Modern Voyager, Cruiser or Slim Cruiser; the 16oz collegiate pint; the 30oz, 40oz or 50oz Trek Tumbler; or any other brand of drinkware.Leak-Proof: This lid creates a leak-proof seal when the flap is closed.Dishwasher Safe: Clean in the top rack of your dishwasher. Environmentally Friendly: The Flip Lid is made from BPA-free plastic, and is double-walled to keep your drink at the perfect temperature longer.