Stanley 30 oz The Quencher ProTour Flip Straw Tumbler. Introducing the iconic Quencher, now with the leakproof ProTour Flip Straw lid. The 30-ounce Quencher ProTour Flip Straw Tumbler makes hydration simple — flip up the built-in straw to sip, then snap it shut when you’re done. Classic colors feature fresh graphics with a soft texture on the handle and two-tone lid. Your water stays ice cold for hours, thanks to double-wall vacuum insulation. It’s ready to grab by the comfort-grip handle and fits in your car’s cup holder. 30 oz ProTour Flip Straw lid fits all 30 oz Quenchers.