Promotional Tumblers & Travel Mugs, Cork Bottom Maddox 20 oz Vacuum Insulated Tumbler - Stainless Steel, 20 oz. copper plated double walled vacuum insulated 18/8 stainless steel tumbler travel mug with cork base bottom keeps your drink icy cold or super hot all day or night. Narrow and tall design fits most cup holders. Clear slide lock lid guards against spills and splashes. Hand wash only. ... #SSTB020CR $15.59/each.