Our leakproof Loop Cap for both Classic and TKWide bottles is great to transport your drinks safely without any drips or leaks. Using the handy attachment loops, clip your Kanteen to just about anything. Our Classic loop is made from polypropylene (pp#5), which contains no BPA or toxins. Our Insulated Wide Loop Cap increases the thermal performance of our TKWide bottles with its integrated one-piece vacuum insulated stainless steel center, creating a full stainless steel interior, in a low profile design with easy-carry swivel loop handle. Loop caps are available on many sizes and styles of our bottles.