Klean Kanteen Classic bottles have three different cap styles: Sport 2.0, Loop and Flat. The revolutionary Sport Cap 2.0 effortlessly delivers a high flow rate that makes it easy to drink from your bottle without removing the cap. The Loop Cap is totally leakproof and has a durable attachment point so you can clip it on to just about anything. And the Flat Cap is low-profile, unobtrusive and leakproof.
All Klean Kanteen caps are made from polypropylene, a safe plastic that's free of BPA, phthalates and other toxins. But if you want to be sure your drink never touches anything other than stainless steel, the Flat and Loop caps are available in a stainless steel version for Klean Kanteen Classic bottles. Order the Stainless Flat Cap or the Stainless Loop Cap.