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Hydro Flask Stainless Steel Flat Cap - Standard Mouth

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The Stainless Steel Flat Cap is perfect for those who prefer their liquids never touch any plastic. The top is made from polypropylene PP#5, while the inner threading is made from 18/8 stainless steel, which ensures an all stainless steel contact with the flask's contents. 

The Flat Cap fits on our Standard Mouth flasks, including the 12 oz and 21 oz flasks.

Like all Hydro Flask products, the Stainless Steel Flat Cap is both BPA and toxin free.