Round Stainless Stainless Steel 5 oz Flask- SALE! Round Stainless Steel Flask with Stainless Steel finish. 5 ounce flask. Stainless Steel. Great for small quantities of fluids. Fits in your pocket. Great for tailgators, or those folks who are hard to shop for! Best with non-acidic liquids. Strong juices should not be put in this type of flask. Click here to Contact Us Product Number: FL12361