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Stainless Steel Cap

sku# 332053615D2000

Product Description

Hydro Flask is proud to announce the release of the Stainless Steel Flat Cap. 

The Flat Cap fits on our Standard Mouth flasks, including the 12oz and 21oz flasks. The Stainless Steel Flat Cap is perfect for those who wish their liquids never touch any plastic. The top is made from polypropylene number 5 (PP5), while the inner threading is made from 18/8 stainless steel, which ensures an all stainless steel contact with the flask's contents. 

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


  • BPA free
  • Flip-top opening has a rubber stopper to help limit spills
  • Hydro Flip lid fits Hydro Flask wide-mouth bottles, including the 18 fl. oz. and 40 fl. oz. bottles (sold separately)


  • 18/8 Stainless Steel
  • Made out of 100% recyclable polypropylene
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