Frequently Asked Questions

At Iron Flask, we're always here for you, especially when it comes to customer care and satisfaction. For your convenience, we've included frequently asked questions about how to care for your Iron Flask, product features, shipping, warranty information, and more.

Our FAQs also include useful tips such as:

  • How to clean stainless steel water bottle products
  • How to clean water bottle straws & lids
  • Deep cleaning methods


Q: What payment methods does Iron Flask accept?

A: We accept many forms of payment including ShopPay, GooglePay, Apple Pay, JCB, and PayPal. We also accept all major credit cards such as Visa, MasterCard, Amex, Discover, Elo, and more.

Q: Can I cancel my order after it has been submitted?

A: No. Once we receive your order, it cannot be canceled. However, we will accept any returns within 30 days, as long as the product is unused and still in its original packaging.

Q: How long will it take for my order to arrive?

A: Once we receive your order, it takes 1–2 days for processing. As soon as your order is processed, delivery times vary based on selected shipping rates. Standard shipping within the contiguous 48 states takes 3–8 business days to arrive; expedited shipping should arrive within 1–3 business days.


Shipping & Handling

Q: Does Iron Flask ship internationally?

A: Yes. Iron Flask now ships to 49 countries outside the U.S., including the following countries: United Arab Emirates, Australia, Belgium, Bahrain, Brazil, Canada, Chile, China, Columbia, Costa Rica, Cypress, Denmark, Egypt, Spain, France, United Kingdom, Guadalupe, Hong Kong, Hungary, Indonesia, Rep. of Ireland, Israel, India, Italy, Japan, Rep. of Korea, Kuwait, Luxembourg, Latvia, Mexico, Malaysia, The Netherlands, Norway, New Zealand, Oman, Panama, The Philippines, Portugal, Qatar, Romania, Russian Federation, Saudi Arabia, Sweden, Singapore, Thailand, Turkey, Taiwan, Tanzania, and South Africa. Due to shipping logistics, the current limit for international orders is $47.

Q: Does Iron Flask offer free shipping?

A: Yes. We offer free standard shipping on U.S. orders of $30 or more, excluding Hawaii, Alaska, and Puerto Rico.

Q: What happens if my order is damaged during shipping?

A: For extra protection, we recommend purchasing Route+ Shipping Protection from damage, loss, and theft during transit. You can also reach out to Iron Flask if an order arrives damaged; e-mail with photographs attached and one of our team members will respond after evaluating the issue.

Q: Can I change my shipping address after the order has been submitted?

A: No. Once your order is submitted, you cannot change your address or request changes to your order.


Product Warranty

Q: Does Iron Flask offer a lifetime warranty?

A: At Iron Flask, our products are built to last a lifetime, which is why we believe in the durability and high performance of all our products. Every purchase comes with a lifetime warranty against manufacturing defects. If your Iron Flask has any manufacturing defects, we will send you a replacement or issue a refund.

For more information about the lifetime warranty, please visit our Warranty page, which details your coverage.

Q: How do I register to receive the Iron Flask warranty?

A: It's easy to register your Iron Flask and receive warranty coverage. Simply visit our Warranty page and fill out the online form, which asks for your name, email, where you purchased your product, and order number. You will also receive emails about special offers and information on new products.


Care & Maintenance

Q: How do I clean a stainless steel water bottle?

A: If you're wondering how to clean a water bottle, we recommend purchasing our cleaning brush, which has durable bristles with powerful scrubbing action. The long handle also allows you to scrub the bottom and sides of any size bottle or tumbler. Simply apply antibacterial dish soap to the bottle brush, add hot water, and scrub the inside thoroughly from top to bottom, including the exterior. Then allow the bottle to dry completely. If you need to use it right away, dry it with a paper towel or clean dish rag.

Our tips on how to clean stainless steel tumblers and our other products are the same — hot water, soap, and our cleaning brush are everything you need to keep your entire Iron Flask collection sparkling clean and sanitized.

Wondering how to remove a smell from a stainless steel water bottle? Leaving your bottle in the car or a bicycle bottle holder for several days or longer often requires a deeper cleaning, and there are several methods we recommend. Hydrogen peroxide, water cleaning tablets, or a bleach solution are three different approaches that can each take care of it. If you notice stubborn oxidation spots accumulating on your bottle over time, simply put ¼ to ½ cup of distilled vinegar in the bottle and gently swirl it around to get a bottle that looks brand new.

For specific instructions on these different deep cleaning methods and other tips on how to clean stainless steel water bottle products, please refer to our Care page.

Q: Can you put stainless steel in the dishwasher?

A: Our customers often ask — is Iron Flask dishwasher safe? The answer is no, and the reason is because the heat from most dishwashers can damage the beautiful powder-coated finish on the exterior. Instead, wash your bottle by hand with hot soapy water.

Q: How should I clean my Iron Flask lids and straws?

A: Here’s how to clean a water bottle straw: use our specially designed straw brushes, which are included in the straw lid set.

Our tips on how to clean an Iron Flask lid are just as easy. Using the water bottle straw, apply a drop of dish soap, add warm water, and scrub all areas of the lid thoroughly, allowing the soap to get sudsy. Rinse clean and allow to dry completely. Or dry with a paper towel or clean dish towel if you need to use it immediately.

Q: How often to clean stainless steel water bottle products?

A: It is essential that you clean your water bottle with a bottle brush and antibacterial soap once a day. Daily sanitizing will ensure that it stays free of bacteria, particularly at the bottom where germs can accumulate in tight corners as well as areas like the straw and lid.


Product Features

Q: What is a vacuum insulated water bottle product?

A: When deciding whether or not to purchase an Iron Flask water bottle, you might be wondering — do stainless steel water bottles keep drinks hot? They absolutely do, thanks to their vacuum-insulated technology. The double-wall of stainless steel insulation keeps drinks hot or cold for hours, so you can always enjoy your beverages at just the right temperature.

Q: How long does my Iron Flask insulated stainless steel water bottle stay hot or cold?

A: It all depends on the size and type of bottle or tumbler. Generally speaking, Iron Flask products keep drinks hot up to 12 hours and cold up to 24 hours.

  • The wide mouth Iron Flask bottle (18-64oz sizes) keeps drinks hot for up to 12 hours and cold for up to 24 hours; the smaller 14oz size keeps drinks hot for up to 8 hours and cold for up to 16 hours.
  • All sizes of the narrow mouth bottles stay cold for up to 24 hours; the 12oz size keeps drinks hot for up to 4 hours; the 16-24oz sizes stay hot for up to 8 hours; and the 32oz and 64oz sizes stay hot for up to 12 hours.
  • The Iron Flask tumbler in the 24 oz and 32 oz sizes keeps drinks cold for up to 16 hours and hot for up to 4 hours. The 16 oz stays cold for up to 12 hours and hot for up to 3.

Q: Can I freeze my stainless steel water bottle?

A: No. Do not place your Iron Flask in the freezer or microwave as this can cause damage to your bottle and appliances. The Iron Flask bottles have a double wall of insulation, which means the temperature of the liquids stays the same, regardless of the external temperature.

Consequently, when you place your bottle in the freezer, it has no effect on its ability to maintain an icy coldness and can damage your bottle or freezer.

Q: What can I put in the Iron Flask?

A: The great thing about stainless steel is that it doesn't retain any residual flavors from different beverages, as long as you scrub it with a bottle brush and hot soapy water after daily use. You can put any beverage, hot or cold, in your bottle and easily clean it with no lingering taste.

Q: Can I put lemon in a stainless steel water bottle?

A: Yes. In fact, a slice of lemon in your water bottle will add some flavor to your daily hydration, giving you another reason to keep drinking throughout the day. For more ideas on enhancing the flavor of water with fresh fruit and other infusions, check out our blog topic, How to Stay Hydrated with Flavored & Infused Water.

Q: Can I put coffee in a stainless steel water bottle?

A: Whether you choose the narrow mouth or wide mouth model, Iron Flask water bottles are designed for ultimate convenience. The vacuum insulated stainless steel is safe for both hot and cold beverages, including coffee. The double wall of insulation will also maintain hot temperatures for hours.

Please keep in mind that if you add any dairy products or milk substitutes to your coffee, make sure to clean and sanitize your bottle after use as soon as possible. If your bottle goes unsanitized for longer than 20 minutes after use, we recommend using any of the cleaning methods of hydrogen peroxide, water cleaning tablets or bleach solution that we referenced in the Care & Maintenance section above.

Q: Are insulated water bottles safe?

A: Iron Flask water bottles and tumblers are made with premium stainless steel, which is non-toxic and never has any flavor transfer. Another benefit of stainless steel is that it's easy to keep clean and sanitized, especially with the bottle brush.

The Iron Flask straws and lids are also made with durable BPA-free plastic, which is not only indestructible but also dishwasher safe. Compared to plastic water bottles, which contain harmful chemicals that can leach into water or other beverages, the Iron Flask product line is better for both your health and the environment.

Q: How do you change the Iron Flask lid?

A: Simply unscrew the lid by turning it to the left. Then place a different lid specifically designed to fit your bottle and twist to the right, ensuring that it is fully attached.

Q: How many ounces in a gallon?

A: There are 128 ounces in a gallon, which is close to the recommended amount of daily hydration for men and women.

At Iron Flask, our new line of one-gallon water bottles makes it easy and convenient to keep on top of your everyday hydration. For more information, please refer to our handy Hydration Guide, which includes U.S. to metric conversions for all our water bottles and tumblers.

If you have any questions that weren't covered in these FAQs, please contact us today. We're happy to help!