Basil HydraFizz Classic Dune is a insulated sipper with flip-up straw & carry handle with a 800 ml capacity, made from double-wall vacuum insulated 304 stainless steel, BPA-free, leak-proof lid. Double-wall vacuum insulation keeps drinks cold for hours and hot for several hours, and the leak-proof lid keeps school bags and backpacks spill-free. The Classic Dune colourway is a warm, sandy dune-beige colourway for teens and adults. Food-safe, BPA-free, FDA approved, hand-wash recommended, backed by Basil's 6-month warranty.