Klean Kanteen has set out to solve the fundamental problems of the vessels we drink from everyday and have certainly succeeded with their new generously-sized 20oz Insulated Tumbler. The food-grade 18/8 stainless steel won't break like glass or end up in a land-fill like single-use plastic cups. And the double-wall vacuum insulation keeps hot or cold beverages just the way you like them and prevents sweating. Comes with press-fit Simple Lid (NOT leak-proof).