Two of our favorite brands demonstrate that it’s not so much what you put in, but what you leave out that makes a product. Case in point? Nau and Klean Kanteen’s new co-branded reusable water bottle. Made from stainless steel, food-grade silicone, and sustainably harvested bamboo, the first-of-its-kind flask is completely free of paint, plastic, and rubber seals. Nau and Klean Kanteen dub this the most environmentally safe, nontoxic water bottle you can buy, but although a glass container might trump that assertion, you can at least rest assured that neither you nor your bottle will crack under pressure. Cheers to that.