Celebrate forty years of the Exploratorium with this beautiful thermos-style bottle. Available in three colors, these fifteen-ounce Laguna Tumblers are made of 18/8 stainless steel, and the double wall foam insulation keeps your hot beverages hot and your cold drinks cold. The snap-fit lid screws on tight, and the sippable pop-top is perfect for controlling spills and keeping your beverages sealed.