Wow! Check out this Otterbox Elevation 20 Stainless Steel Tumbler for Just $17.99! (Reg. $30). Take your favorite beverage anywhere with this 20-oz. OtterBox tumbler. It has a copper-lined interior to keep drinks hot or cold, and it’s made from sturdy stainless steel to withstand wear and tear. This OtterBox tumbler is sweat-resistant, so it won’t leave rings behind, and it fits most cup holders for convenient portability.