Zojirushi Tuff Mug AFE50-XA Stainless Steel 17 oz, SILVER This Tuff Mug is compact and is designed to drink directly out of the bottle. The vacuum insulation provides excellent heat and cold retention and prevents messy outside condensation. It features easy-to-clean nonstick interior, 2-inch wide opening and tight fitted lid to keep contents hotter or colder. Available in two sizes and a variety of colors.