The Loop Cap was designed with athletes and multi-taskers in mind. The handy attachment loop makes it easy to clip your Klean Kanteen(R) onto your backpack, climbing harness, messenger bag or any other place you need quick, easy access to your drink. Made from polypropylene (pp#5), which contains no BPA or toxins. Features Handy attachment loop No BPA, phthalates, lead or other toxins Interchangeable with all Kanteen(R) Classic sizes Dishwasher safe Weight: 1 ounce Size: 2.75" H x 2" W BPA-free polypropylene (pp#5)