Nathan Flipstream Tritan 750ml Bottle Made from BPA-free Eastman Tritan material with odorless and tasteless technology - Non toxic plastic materials. Push-button, quick-flip sip cap - Mechanical access to fluids. . Leak- and spill-proof locking mechanism - Keeps fluids safe within the bottle until usage. Touch-right base - For a slip-free gripping surface. Clip-on performance carabiner - Attaches to belts, backpacks and more.