Narrow Mouth
Water Bottles

Narrow Mouth

Narrow-mouth water bottles have a smaller opening than wide-mouth bottles, so the flow to your mouth happens at a more controlled rate. That means a smaller chance of spilling on your outfit.

About Iron Flask

Iron Flask designs its water bottles to combine form and function. We like to think that people come for the colors and patterns, and stay for the craftsmanship, which includes premium stainless steel, double-wall vacuum insulation, and a range of features and sizes. Our narrow-mouth water bottles come in straw-lid and spout-lid versions, and regardless of which version you choose, you’ll find a flip-top lid and a leak-proof screw-on lid with a handle in the box as well. The 12, 16, 20 and 24 oz narrow mouth water bottle sizes fit nicely in almost any cup holder, but we also offer larger sizes for those who’d rather have tons of water.

Stainless Steel Water Bottles

Carrying an Iron Flask water bottle screams good taste—and not just because of their eye-catching colors and patterns. They also happen to be made from 18/8-grade stainless steel that won’t transfer flavor to your beverage (or single-use plastic trash to the landfill).

Vacuum-Insulated Water Bottles

Whether you’re toting ice-cold water or boiling hot tea, double-wall vacuum insulation protects your liquid from heat transfer, keeping that water cold for up to 24 hours and that tea hot for up to 12.

Water Bottle Lids & Accessories

Use one of the three included lids to suit your bottle to the moment’s need. Want your narrow-mouth bottle to live its best life? Check out our water bottle accessories like protective boots, cleaning brushes, and more.

Water Bottle Warranty

At Iron Flask, we stand behind the quality of our water bottles. We offer our customers a lifetime warranty against manufacturing defects and a 100% satisfaction guarantee on all of our products, to make sure you’re stoked about your purchase.

One for Everyone

One for Everyone

Iron Flask has become a favorite of many because of our strong, durable, and affordable double-wall vacuum insulated, stainless steel, reusable water bottles. Our Iron Flask is ...

The Ocean Thanks You

The Ocean Thanks You

The Goodness of Your Vacuum Insulated Stainless Steel Water Bottle If you are the proud owner of an Iron Flask, thank you and congratulations, you are hydrating in style. Consid...

Top Advantages of Drinking a Gallon of Water Every Day

Top Advantages of Drinking a Gallon of Water Every Day

Everybody knows the health benefits of drinking water, including better athletic performance, vibrant, glowing skin, good digestion, and much more. But putting it into practice ...