Hydrate on the go

Bringing a water bottle through airport security security in Canada

It was a warm August morning, and Daniel was flying out to visit family. He’d packed light, checked in with his airline and joined the security line with his carry-on in tow. Like many travellers, Daniel wasn’t aware of the security rules for liquids.

The lineup was moving quickly, but after his carry-on went through the x-ray machine, a CATSA screening officer reminded him that full water bottles are not allowed past security.

Daniel looked surprised. “But it’s just water”, he said.

We get it. Water seems harmless—and in most cases, it is. But when it comes to flying from a Canadian airport, even water has to follow the 100 mL rule.

If you’ve ever been unsure about the rules for carrying water through security, you’re not alone. So here’s a list of what’s allowed, what’s not, and how to stay hydrated without slowing down your travel day.

The rule: No water over 100 ml in carry-on

When departing from a Canadian airport, any liquid—including water—must follow these rules:

• Maximum amount: 100 mL (3.4 oz)
• All containers with permitted liquids must fit in a single, clear 1 L resealable plastic bag
• One bag per person
• Unless instructed otherwise, the bag must be removed and screened separately at the checkpoint

How can you hydrate?

You don’t have to go thirsty while travelling. Here are your best options:

• Bring an empty reusable bottle. Pack an empty metal or plastic water bottle in your carry-on
• Go through security
• Fill it up at a water fountain or refill station near your gate

Most major Canadian airports, including Toronto Pearson, Montreal-Trudeau, Calgary, Vancouver and Halifax, have refill stations available in post-security areas.

1. Buy bottled water after screening. If you forget your reusable bottle, you can always:
   • Purchase bottled water at a restaurant or shop once you are through security
   • Bring it onboard with you—there are no restrictions on amounts after screening
2. Travelling with a baby (0-24 months) or have a medical need? You can bring water over 100 mL if:
   • It’s for baby formula, infant needs, or a medical condition
   • You declare it at the checkpoint
   • You are ready for it to be inspected. Just make sure to separate these items from your regular liquids and advise the screening officer.

What happens if you forget?

If you bring a full water bottle to the checkpoint, you’ll be asked to leave the screening area to dispose of it and go back to the end of the queue. Not ideal if you have a tight connection.

Final tip: Hydrate smart, travel smoothly

Flying with fluids doesn’t have to be confusing. As long as you follow the 100 mL rule or bring an empty water bottle, you’ll go through security screening without any hiccups.

To check the security screening rules before your flight and make sure you pack right, check these useful CATSA tools:

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