Custom Tumblers & Travel Mugs, Maddox 20 oz Double Walled Stainless Steel Tumbler - Slide Lock Lid, Double walled insulated tumbler travel mug with stainless steel outer wall and polypropylene inner wall liner keeps your drink cold or hot for an extended time. Narrow and tall design fits most cup holders. Clear slide lock lid guards against spills and splashes. Hand wash only. ... #SSTB020L $7.73/each.