- The 32-ounce Double Walled Insulated Thermo Mug has a wide handle and a leak-resistant, snap-on lid for easy travel. Comes with a drink-through swivel lid and a 11″ flexible, corrugated straw and cap to provide multiple drinking options. Its double-wall insulation will keep beverages cold without sweating. The oz and cc/ml markings makes this great for hydration monitoring. These mugs, by Whirley Drink Works, are used by Hospitals and Medical Centers across the USA.