Houdini Pocket Flask (6-Ounce, Stainless Steel) Carry favorite beverages anywhere with this pocket-sized flask. Easily grip and twist the knurled screw cap that is attached to the flask so that it cannot be lost. Carry up to 6 ounces of liquid in this lightweight and convenient container. Stainless steel construction resists corrosion and will not retain flavors. Discreetly carry this flask in a pocket with its gently curved contour.