If you’re someone who never leaves home without your bottle, you might be wondering: can you bring a water bottle on a plane in 2025?
We're lucky here at Just Bottle that our Co-founders have a background in aviation, so we've picked their brains and put together a comprehensive guide.
The short answer is yes - if the water bottle is empty. This is because airport security and intelligence agencies are concerned about liquids, not the bottle itself.
Quick find
General rules about carrying a water bottle on a plane
Domestic v International flights
Refilling your bottle at the airport
What if there's liquid inside the bottle?
If there is liquid inside the water bottle then it depends on which country you're in, and whether you're flying on a domestic (flight that doesn't leave the country) or an international flight.
In most cases if the flight is domestic there is no restriction on liquids and if it's an international flight the limit is usually 100ml (3.4oz). In this article, we'll dive more into the world of airline liquid regulations, explore the 3-1-1 rule in the USA, and provide some helpful tips for navigating the complexities of air travel with your favourite reusable bottle.
Why are there airline liquid rules?
Airlines have certain rules in place to ensure the safety of all passengers, the rules are set by the airlines to make sure they abide by the laws of the countries that they fly to.
Before we dive into the details, let's take a moment to understand why these regulations exist. Airline liquid regulations are designed to prevent potential threats and ensure the safety of everyone on board.
For example, the limit of 100ml of liquid on international flights was introduced in 2006 after a potential terrorist attack was uncovered using liquid explosives. By implementing these rules, airlines can maintain a safe environment while still allowing passengers to carry essential items.
General rules about carrying a water bottles on a plane
Since you could be reading this from anywhere in the world, lets outline the general liquid rules that apply in most airports in most countries when it comes to bringing a bottle of water on board a plane. The first thing to note is that the material of the bottle does not matter, whether it's single-use plastic water bottles or stainless steel water bottles, the same rules apply.
Carry-on Baggage v Checked Luggage:
The liquid rules and regulations only apply when you take the water bottle with you on board or in your hand luggage.
If you are planning on brining bottled water or a reusable metal water bottle on board the plane with you (or in hand luggage), be aware of the type of flight that you are on. One thing to note is that all flights whether international or domestic will allow an empty water bottle of any size to be carried on board the airplane, as mentioned earlier, the issue is only with the liquid, not the actual bottle.
If in doubt, just empty the liquid from the bottle to avoid any hassle at airport security, you can always ask the cabin crew on board to fill up the water bottle for you if you don't want to purchase plastic water on board.
The water that the flight attendant will fill your bottle with is safe to drink and is know at "potable" water. If you have time, you can also refill the bottle at the airport once you clear security, as the liquid rules only apply when passing through airport security checkpoint to stop any unknown liquids from outside making their way on board the plane.
Most airports will have a water station once you're past security that you can use to fill up your bottle with to use for the rest of your trip. This will not only save you money as the airport prices for bottled water are very expensive, but will be a more sustainable choice too by cutting down on single-use plastic bottles.
Can I bring a water bottle in checked baggage?
If you're planning to pack your bottle in your checked bag for you to use at your destination without taking it on board, there are no rules that apply.
You can fill it with liquid or pack it empty, just remember to make sure the lid is tightened properly if it's going in your checked baggage to avoid any spills - your luggage will be thrown around whilst it gets loaded and unloaded from the aircraft, and if there is any turbulence in flight!
Domestic v International Flight:
As touched on at the start of the article, domestic flights that don't leave the country will not have a limit to the amount of liquid that you can carry on board, take the chance to fill up your bottle so that you have enough water for the flight. The exception to this is in the USA where the 100ml (3.4oz) liquid rule applies to both domestic and international flights.
All international flights have a 100ml (3.4 oz of water) limit when passing through airport security. What most passengers don't realise is that if you choose to take liquid through an international airport, Top Tip: if you choose to take water inside the bottle, the security officer will usually need to see a label on the bottle to prove the size of the container in ml or oz.
To be safe, when planning on taking your water bottle with you in carry-on bags, just make sure it's empty. As mentioned earlier, most places will have airport water fountains available to refill your reusable bottle after you clear security which you can then take on board the plane.
Note: International Flights to Australia:
If you're flying to Australia from an international airport take note - there are usually two points of security screening, the first is the general airport security and the second is a final check at the departure gate (including liquids). These rules are made by the Australian government as an extra layer of security.
When flying on an international flight to Australia, don't make the mistake filling up or buying a bottle of water after clearing airport security, it will be taken from you at the departure gate!
USA: TSA's 3-1-1 Rule Explained
The TSA's (Transportation Security Administration) 3-1-1 rule is a general guideline that applies to flights departing from or within the United States. It says that passengers are allowed to bring liquids in containers that are 3.4 ounces (100 milliliters) or less, all placed in 1, quart-sized clear plastic bag. Each passenger is allowed 1 bag, and the bag must be able to fully close.
This rule is in place to make the security screening process more efficient, as it allows officers to quickly and easily inspect liquids without compromising safety. By limiting the size and quantity of liquids, security personnel can focus on identifying any potential threats effectively.
It's important to note that the 3-1-1 rule applies to carry-on luggage. If you're checking in your bags, you can pack larger quantities of liquids in your checked baggage. However, it's always a good idea to double-check with your airline's specific regulations to avoid any surprises at the airport.
Exceptions to the Rules
Can I bring baby formula on a plane?
Essential items, such as medications and baby formula, are allowed in amounts above the 100ml, 3.4-ounce limit. However, these items may be subject to more screening or verification at the airport.
Parents are allowed to bring an "adequate amount" of baby formula for the duration of the flight. To avoid delays at the security line, make sure to tell the TSA agent or security official that you're carrying baby formula or breast milk before you put it on the tray to be screened.
For medications, it's best to carry them in their original packaging with the prescription label. This helps airport security personnel identify the medication and ensures a smooth screening process.
If you have any doubts about specific medications or medical supplies, it's best to consult with your healthcare provider (to make sure it's safe to fly) and contact the airline in advance about the security rules for your specific medication.
By understanding the basics of airline liquid rules, you can help make the security screening process smoother for yourself, and everyone behind you. Remember to pack your liquids in accordance with the 3-1-1 rule, be aware of any exceptions, and always stay informed about any changes or updates to these regulations.
Preparing your water bottle for air travel
Now that you understand the basics of airline liquid regulations, let's talk about how to prepare your trusty water bottle for air travel. Staying hydrated during your journey is crucial, and having a reliable water bottle by your side can make all the difference.
Choosing the right water bottle
Look for a bottle that is lightweight, durable, and leak-proof. After all, the last thing you want is to open your bag and find that the water has spilled!
Our advice for air travel is to avoid glass bottles, as they may break during the flight and pose a safety risk to you and your fellow passengers.
A high quality stainless steel water bottle is a great choice, look for a stainless steel water bottle with double wall vacuum insulation. Long flights can be uncomfortable, so knowing that you have a bottle of ice cold water or a hot cup of tea to sip from might help.
Refilling your water bottle at the airport
Once you've gone through security, it's time to refill your empty bottle for the flight ahead. Having a full water bottle at the start of your flight and making sure you finish the whole bottle is the best way to keep hydrated on your next flight.
Airports around the world give travellers the eco-friendly option to refill their water bottle. Look out for water refill stations, which are typically located near restrooms or near food and beverage outlets.
These stations usually have filtered water, ensuring that your refill is clean and safe to drink. Some airports even have designated hydration stations with multiple refill points.
Tips for keeping hydrated on long flights
- Drink plenty of water before your flight to start well-hydrated and regularly sip water throughout the flight.
- Add electrolytes to the water, this helps your body hold onto the water in the dry aircraft cabin.
- Avoid excessive alcohol and caffeine, as they can contribute to dehydration - the cabin is usually pressurised to 8,000ft so alcohol has more of an effect.
- Consider packing a hydrating facial mist, a small moisturiser and lip balm to combat dryness.
- Take regular walks throughout the cabin and do a few stretches to keep your blood flowing and prevent fluid retention.
The impact of using a reusable bottle when travelling
It's great to consider the environment when travelling. Reusable water bottles can play a significant role in reducing plastic waste in airports and beyond.
By bringing your own water bottle, you can significantly decrease the number of plastic bottles that end up in landfills or oceans. It's estimated that millions of plastic bottles are discarded in airports each year.
Be a conscious traveler and choose to refill your bottle rather than purchasing single-use plastic bottles. Every small action counts!
To summarise, can you bring a water bottle on a plane? The answer is yes, on every flight if it's empty and as long as you follow the airline liquid regulations if it's full of water - usually 100ml (3.4oz) for international flights or domestic flights in the USA.
Remember that the material of the water bottle doesn't matter so there's no need to leave your favourite stainless steel reusable bottle at home, so cheers to staying hydrated and reducing plastic waste on your next adventure!
FAQ's
Can I bring a water bottle on a plane?
Yes – you can bring a water bottle on any flight as long as it’s empty when going through airport security. The restriction is on liquids, not the bottle itself. For international flights, you’re generally allowed to bring up to 100ml (3.4oz) of liquid if the volume is clearly labelled on the bottle. On most domestic flights, especially outside the USA, bringing water through security is usually permitted — but to avoid any issues, it's best to empty the bottle beforehand. Once past security, you can refill it at a water station or ask the cabin crew to fill it onboard.
Can you bring baby formula on a plane?
Yes - baby formula and breast milk are exempt from the rules and are allowed in quantities over 100ml. You should inform security officers before screening, and the formula may be subject to additional checks. Always pack enough for the duration of the flight and bring it in clearly labelled containers if possible.
Can I pack a full water bottle in checked luggage?
Yes - there are no liquid restrictions for bottles packed in checked baggage. Just make sure the lid is tightly sealed to avoid spills during transport.
