Super Mario vs Bowser Mario Kart Stainless Steel Water Bottle. Quench your thirst in style with this stainless steel water bottle. Available in 2x sizes (12oz, 18oz, ) this water bottle features a double-wall stainless steel build that keeps your drinks frosty for 24h and soothingly hot for 12h. This BPA-free, steel water bottle comes with a twist-on lid for easy sipping, making it excellent for daily use at work, at college, in the car, and beyond. .: Standard twist-on lid .: Available in three sizes: 12oz (0.35 l), 18oz (0.53 l) .: Double-wall stainless steel construction