Klean kanteen all stainless loop cap description if you want a 100 percent stainless environment inside your bottle but also need a functional attachment point then this durable cap is for you made completely out of 188 food grade stainless steel including the threads so your drinks never touch plastic dishwasher safe features durable all stainless design dishwasher safe handy attachment loop creates all stainless interior interchangeable with all kanteen classic sizes