Facts About Stainless Steel Tumblers - Custom Tumblers - Shutterfly Uncovered Credit: Laura Casner Best for Hot Drinks, RTIC 20-Ounce Tumbler Double-wall insulated stainless steel 20 oz Exceptional insulation for hot drinks, Fairly economical, Doesn't spill much if toppled, Cover appears to be a possible powerlessness, No rubberized base, The