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.
Posted by Kim Keeling on 01/16/2014
I recently developed an allergy to plastic, especially water bottles. I'm so thankful for this lid!!!! Hydro Flask has made my life so much easier! Thank You!!!
Posted by SunTrish on 09/24/2013
Like everything Hydro Flask, we love these products. I especially like that there is an option for a metal - not plastic - top, and we always use this one when we have a hot beverage in our Hydro Flask. The metal lid doesn't seem to drip as much steam when removed from a hot beverage as the plastic lids do. I wish this top had a ring for ease of carrying. I sometimes use Kleen Kanteen's metal and bamboo top with folding ring as it seems to fit the standard mouth Hydro Flask, but I am not as confident about it not leaking with the KK lid if the bottle is going to be tossed around.
Posted by Mike D on 09/24/2013
There is not much to say. This lid keeps the liquid in. Keeps the liquid cold. It works as advertised.
Posted by Hawaiian style on 06/20/2013
Really would like to buy this for my bottles but I only own the wide mouth bottles. Also just like another person wrote in the hydro flip review it would be nice to have some kind of strap from the bottle to the cap. So you don't drop the nice stainless cap on the ground and damage or loose it. Also it's nice to have some way to strap it to your bag or waist when on the move. Mahalo:)