Can You Bring A Hydroflask On A Plane?

Since its invention in 1903, the modern airplane has transformed how people traverse the globe, but with this rapid mobility comes a detailed set of regulations, especially concerning carry-on items. When it comes to staying hydrated, many travelers prefer using a Hydro Flask—a popular brand of vacuum-insulated stainless steel water bottle designed to keep drinks cold or hot for extended periods. The question of whether one can bring a Hydro Flask on a plane taps into broader security measures that have evolved significantly, particularly since the early 2000s.

The regulations regarding carry-on items on an airplane have become a focal point for passengers and security personnel alike. Following the September 11th, 2001 attacks, the Transportation Security Administration (TSA) was created in the United States and similar organizations worldwide tightened the rules on what is permissible on board. This included strict limits on liquids, gels, and aerosols as a preventive measure against potential threats. Consequently, when a traveler considers bringing a Hydro Flask or any reusable bottle on a plane, they must navigate these post-9/11 security protocols which continue to impact travel. The question of bringing a Hydro Flask on a plane highlights personal convenience and environmental consciousness amidst security protocols aimed at ensuring safe air travel.

can you bring a hydro flask

Can You Take A Hydroflask On A Plane?

When traveling by air, many passengers wonder if they can take their Hydroflask on a plane. The answer is yes, you can take a Hydroflask on a plane, but there are certain regulations you must follow. The Transportation Security Administration (TSA) allows travelers to bring a Hydroflask through security as long as it is empty. You cannot take liquids in containers larger than 3.4 ounces through the security checkpoint, but once past security, you can fill your Hydroflask at a water fountain or purchase a beverage to fill it. This is not only convenient but also environmentally friendly, as it reduces the use of plastic water bottles. For more detailed information on traveling with a Hydroflask and tips on how to make your flight experience smoother, continue to the next section where we delve deeper into the subject.

Hydro Flask Regulations on USA Domestic Flights

TSA Guidelines for Carry-On Luggage

For travelers looking to bring a Hydro Flask on a domestic flight, the Transportation Security Administration (TSA) provides clear guidelines on what is permissible in your carry-on luggage. Hydro Flasks are allowed through security checkpoints, as long as they adhere to the TSA’s policies.

  • Empty Hydro Flasks can be carried on a plane.
  • Liquids within Hydro Flasks must comply with the 3-1-1 liquids rule (3.4 ounces or less per container, 1 quart-sized, clear, plastic, zip-top bag, 1 bag per passenger).
  • The Hydro Flask should be presented separately during the security screening process.

Refer to the official TSA guidelines for the most current information on traveling with an empty travel mug, such as a Hydro Flask.

Checked Baggage Considerations

If packing a Hydro Flask in checked luggage, there are fewer restrictions compared to carry-on items. However, it is recommended to ensure your Hydro Flask is empty and securely stored to prevent damage.

  • Hydro Flasks can be packed full or empty in checked bags.
  • No volume limits for liquids in Hydro Flasks in checked luggage, but the airline’s weight restrictions still apply.

Using Hydro Flask During The Flight

Once past security, passengers can fill their Hydro Flasks at a water fountain or buy beverages before boarding. During the flight, flight attendants may also assist in refilling your Hydro Flask.

  • Hydro Flasks can be used on the plane for personal hydration.
  • Be aware of flight attendants’ instructions for stowing personal items during take-off and landing.

Environmental Benefits and Hydration

Carrying a Hydro Flask on domestic flights can help reduce plastic waste and keeps travelers hydrated, particularly on longer flights where cabin air can be dry.

  • Using a Hydro Flask supports eco-friendly travel by minimizing disposable plastic use.
  • Stainless steel construction maintains beverage temperature for prolonged periods.

Air Travel Tips for Hydro Flask Owners

To make your flying experience smoother with a Hydro Flask, consider the following tips:

  • Keep your Hydro Flask accessible for security screenings.
  • Fill your Hydro Flask after passing through security to stay hydrated.
  • Remember to empty your Hydro Flask before your return flight security screening.
✔ Pros ✘ Cons
Environmentally-friendly compared to single-use plastic bottles Must be empty when passing through airport security
Maintains temperature of liquids for a longer period Potentially heavy or bulky depending on size
Durable and designed for long-term use If full or contain liquid, it may be confiscated by airport security
Cost-effective over time as you don’t need to buy bottled water There can be a hassle to find water refilling stations in some airports
Hydroflasks can double as a container for hot beverages Additional screening may delay you at the security checkpoint

International Air Transport Association (IATA) Guidelines

The International Air Transport Association (IATA) provides guidelines for passengers traveling with personal items, including hydro flasks or insulated water bottles. According to IATA regulations, passengers are permitted to carry hydro flasks on board, but they must adhere to certain conditions, especially concerning the transport of liquids.

  • Liquids carried in hydro flasks must comply with the 3-1-1 liquids rule for carry-on bags, which allows containers with up to 100 milliliters (3.4 ounces) of liquid.
  • Hydro flasks should be empty when passing through airport security checkpoints to avoid delays.
  • Passengers are advised to check with their specific airline for any additional restrictions or allowances.

For the most accurate and current information, passengers should refer to the IATA website or contact their airline directly.

Citation: IATA Website

Country Specific Regulations

When flying internationally with a hydro flask, it’s crucial to be aware that regulations can vary by country. Each nation may have its own rules regarding the transportation of liquids and personal items through airport security and on aircraft.

United Kingdom

  • Hydro flasks must be empty when going through security.
  • Liquids in carry-on luggage must not exceed 100 ml per container.

Citation: UK Government Hand Luggage Restrictions


  • The European Union has similar restrictions to the UK, requiring liquids in containers of no more than 100 ml.
  • Hydro flasks should be presented separately during security screenings.

Citation: European Commission – Liquids in Hand Luggage


  • Travelers must adhere to the Canadian Air Transport Security Authority (CATSA) guidelines, which include the 100 ml liquid limit.
  • Hydro flasks can be carried on board but must be empty when screened.

Citation: CATSA Website


  • Liquids, aerosols, and gels must be in containers of 100 ml or less.
  • Hydro flasks are allowed but must be empty before security screening.

Citation: Australian Government Department of Home Affairs

New Zealand

  • Restrictions similar to Australia apply, with a 100 ml limit on liquids in carry-on luggage.
  • Hydro flasks should be presented empty at security checkpoints.

Citation: New Zealand Civil Aviation Authority


  • Many Asian countries follow the standard 100 ml rule for liquids in carry-on bags.
  • Passengers should check with local airport security for specific country regulations.


  • Liquids in carry-on must be in containers not larger than 100 ml.
  • Hydro flasks are permitted aboard but must be empty during security screening.

Citation: Changi Airport Security Guidelines

10 Airline-Specific Regulations for Flying with Hydro Flask

Different airlines may have their own specific policies regarding the transportation of hydro flasks and other personal items. It is important for travelers to review their airline’s regulations before flying to ensure compliance and avoid any inconvenience.

American Airlines

  • Empty hydro flasks are allowed in both carry-on and checked baggage.
  • Liquids must adhere to the TSA’s 3-1-1 rule.

Citation: American Airlines Carry-On Baggage

Delta Air Lines

  • Passengers can bring an empty hydro flask through security and fill it post-security.
  • Liquid restrictions follow the TSA’s standard guidelines.

Citation: Delta Air Lines Carry-On Baggage

United Airlines

  • Hydro flasks are permitted as long as they are empty when passing through security.
  • All liquids in carry-ons must be 100 ml or less.

Citation: United Airlines Carry-On Baggage

Southwest Airlines

  • Empty hydro flasks can be brought on board and filled after the security checkpoint.
  • Liquids over 3.4 ounces are not allowed in carry-on luggage.

Citation: Southwest Airlines Carry-On Policy

Air Canada

  • Hydro flasks are allowed on board but must be empty when going through security.
  • Liquids must comply with CATSA’s liquid restrictions.

Citation: Air Canada Carry-On Baggage

British Airways

  • Empty hydro flasks are allowed in hand luggage.
  • Any liquids must be within the UK’s 100 ml limit.

Citation: British Airways Hand Baggage Allowances


  • Hydro flasks can be carried on, but must be presented empty at security checks.
  • Liquids in carry-on luggage are limited to containers of 100 ml.

Citation: Lufthansa Carry-On Baggage


  • Passengers are permitted to bring an empty hydro flask on board.
  • All liquids must adhere to Australian liquid regulations for carry-on.

Citation: Qantas Carry-On Baggage

Air New Zealand

  • Hydro flasks are acceptable as long as they are empty at the time of security screening.
  • Liquids must be in containers of 100 ml or less, in accordance with New Zealand’s security regulations.

Citation: Air New Zealand Carry-On Baggage


  • Travelers can bring hydro flasks on board, but they must be empty during security checks.
  • Liquids in carry-on bags must be in containers no larger than 100 ml.

Citation: Emirates Cabin Baggage

How to Pack a Hydro Flask in Your Luggage

When you are planning to travel, bringing your Hydro Flask can ensure you stay hydrated while saving money and reducing plastic waste. But packing a Hydro Flask can sometimes be challenging, given its size and shape. Here are some tips on how to pack a Hydro Flask securely in both your carry-on and hold luggage.

Packing a Hydro Flask in Carry-On Luggage

If you plan on taking your Hydro Flask in your carry-on, you need to remember the restrictions on liquids and how to best protect the flask from damage or causing issues during security screenings.

  • Empty the Flask: Ensure your Hydro Flask is completely empty before going through airport security to adhere to the liquid restrictions imposed by most airlines.
  • Protect and Cushion: Use a soft cloth or bubble wrap to wrap the Hydro Flask, protecting it from scratches and dents. It will also prevent it from rattling around during transit.
  • Place It Strategically: Position your wrapped Hydro Flask in the middle of your carry-on bag, surrounded by softer items of clothing to act as additional padding.
  • Accessible for Security: Place your Hydro Flask in an area of your carry-on that can be easily accessed in case security personnel wish to examine it more closely during the screening process.

taking a hydroflask through airport security

Packing a Hydro Flask in Hold Luggage

When packing a Hydro Flask in your hold (checked) luggage, you can take advantage of more flexibility concerning space and less stringent liquid restrictions.

  • Double Check for Leaks: Even though liquid restrictions are less strict in hold luggage, it’s best to ensure your flask is empty or closed tightly to prevent spills.
  • Secure the Lid: Tighten the lid of your Hydro Flask. Consider wrapping the lid separately with plastic wrap to provide an extra seal against any potential leaks.
  • Wrap for Protection: Use bubble wrap or clothing to insulate your Hydro Flask. This acts as a protective layer against the rough handling of luggage.
  • Optimal Placement: Place your Hydro Flask in the center of your suitcase, ideally between layers of clothing to ensure it is snug and won’t move around during transport.
  • Use Shoes for Support: Utilize the sturdy structure of shoes by placing a wrapped Hydro Flask inside, providing extra protection against impact.

By following these simple steps, you can ensure your Hydro Flask is packed efficiently and safely, ready to keep you hydrated throughout your journey. Remembering to secure it well will also help you avoid any potential complications when passing through airport security.

Essential Travel Items Similar to a Hydro Flask

When preparing for air travel, alongside your trusty Hydro Flask, consider packing a collapsible water bottle for space-saving hydration, noise-cancelling headphones to block out the engine hum, a travel pillow for neck support during naps, and a compact power bank to keep your devices charged. Don’t forget a lightweight, reusable shopping bag for any in-flight purchases or extra items you might acquire. A portable luggage scale can also be a lifesaver to avoid overweight baggage fees, and a TSA-approved luggage lock will keep your belongings secure. Lastly, a travel-sized hand sanitizer and disinfectant wipes are essential for maintaining hygiene in the close quarters of a plane.

FAQs About Can You Bring A Hydroflask On A Plane?

Travelers often have questions regarding what items they can bring on a plane, and a common query is about the rules for carrying a Hydro Flask or other reusable water bottles. Below you’ll find a curated list of frequently asked questions that aim to address any concerns or uncertainty relating to traveling with a Hydro Flask on an airplane.

Can I bring my empty Hydro Flask through airport security?

Yes, you can bring your empty Hydro Flask through airport security. However, ensure it is completely empty as security will not allow liquids greater than 3.4 ounces (100 milliliters).

Why does my Hydro Flask have to be empty when I go through security?

Your Hydro Flask must be empty because TSA regulations prohibit liquids in containers larger than 3.4 ounces. Liquids must be in a clear, quart-sized bag for screening.

Can I fill my Hydro Flask with water after passing through airport security?

Yes, once you pass through security, you may fill your Hydro Flask at water filling stations or fountains located in the airport terminal.

Will the X-ray machine at security damage my Hydro Flask?

No, the X-ray machine at airport security will not damage your Hydro Flask or affect its insulation properties.

Can I bring a full Hydro Flask on my international flight?

You cannot bring a full Hydro Flask through international security checkpoints due to liquid restrictions, but you may be able to fill it after passing through security, depending on the airport facilities.

Are there any size restrictions for bringing a Hydro Flask on a plane?

There are no specific size restrictions for empty Hydro Flasks; however, it must be able to fit within your carry-on bag or personal item dimensions allowed by the airline.

Can my Hydro Flask with water be in my checked luggage?

Yes, you can put your Hydro Flask with water in your checked luggage, though it may be subject to weight limits and could increase the risk of leakage.

Can I bring a Hydro Flask with ice on a plane?

Ice is subject to the same restrictions as liquids, so it can only be brought past security if it is frozen solid. However, it is likely to melt, so it’s advisable to fill your Hydro Flask with water after security instead.

Are there any airlines that prohibit Hydro Flasks?

No airlines specifically prohibit Hydro Flasks. However, you should comply with the airline’s size and weight limits for carry-on luggage when packing your Hydro Flask.

Can I drink from my Hydro Flask during the flight?

Yes, you can drink from your Hydro Flask during the flight. Flight attendants can also assist with refilling it if needed.

Packing It All Up

In summary, bringing a Hydro Flask or any other insulated water bottle on a plane is perfectly permissible, as per TSA regulations, provided it is empty during the security checkpoint screening process. It is important to ensure your Hydro Flask is devoid of any liquids to avoid being flagged by TSA agents. Once past the security checkpoint, you can fill your Hydro Flask at water fountains or purchase water before boarding the plane, thus staying hydrated in an eco-friendly manner throughout your flight.

Furthermore, when packing your Hydro Flask in checked luggage, there are no restrictions against doing so. However, ensuring that the flask is securely packed to prevent damage from the rigors of air travel is essential. The versatility and durability of Hydro Flasks make them an excellent travel companion, enabling travelers to maintain their hydration habits sustainably without relying on single-use plastics. Embracing this practice aligns with environmentally conscious travel and contributes to minimizing your carbon footprint while on the go.