Carry-on and Liquids Rules in Canada: What Actually Gets You Stopped at Security

Key rules to keep you moving through screening:

• Liquids, gels, aerosols: containers must be 100 mL (3.4 oz) or less and fit inside a single clear 1 L resealable bag.
• Duty-free liquids bought after security are allowed in sealed bags with receipt — keep them separate.
• Food: solid foods are fine; liquids and soups follow the 100 mL rule.
• Electronics: laptops must come out unless in a laptop-enabled bag; smaller devices may stay in the carry-on.

Getting through CATSA screening quickly is largely about packing smart and being predictable. Below is a practical, detailed guide that explains the rules and common pitfalls, with step-by-step tips to speed up your screening.

The basics: liquids, gels, aerosols

The 100 mL / 1 L bag rule is simple in principle but often applied strictly in practice. Every container larger than 100 mL will be flagged, even if the container is partially full. All permitted containers must fit comfortably inside a single transparent resealable bag with a maximum capacity of 1 litre.

What counts as a liquid? toothpaste, creams, lotions, perfumes, deodorants, gels, sauces, and aerosols are all considered liquids/gels/aerosols for screening purposes.

Duty-free exceptions

Duty-free liquids purchased after screening are permitted if they remain sealed in tamper-evident bags with the original receipt visible. If you transfer a bottle into your carry-on after leaving the secure area, it can be treated as a regular liquid and may be restricted.

Food and medications

Solid foods are generally allowed; soups, yogurts, and sauces follow the liquids rule. Medications in liquid form are permitted in quantities greater than 100 mL when medically necessary, but you should have supporting documentation and declare them at screening.

Electronics and screening flow

Larger electronics such as laptops should be removed from bags and screened separately unless your bag is designed for laptop-friendly screening. Smaller devices (e-readers, phones, tablets) usually stay in the bag, but be ready to remove them if asked.

Common mistakes that slow you down

• Packing liquids in opaque toiletry kits or in checked pockets (not visible) — screeners will have to examine them manually.
• Overfilling containers (they look larger or are labelled >100 mL).
• Not separating electronics and liquids near the top of the bag.

Practical packing checklist

1. Place all 100 mL containers in a single, accessible 1 L clear bag.
2. Keep the bag at the top of your carry-on for easy access.
3. Place laptop in a laptop-friendly sleeve or at the top of your carry-on.
4. Pack liquids you don’t need in checked luggage when possible.
5. Keep medications and baby food separate and declare them on arrival at screening.

Speed-up tips at the checkpoint

• Wear shoes easy to slip off and on.
• Have boarding pass and ID ready.
• Empty pockets and keep keys/wallet in a separate bin if needed.
• If you travel frequently, use expedited programs (e.g., NEXUS) where available.

What to do if an item is flagged

If a liquid or device is flagged, remain calm and follow directions. Many items are allowed after inspection; others must be discarded. Request a supervisor for clarification if you believe the item is permitted.

Final note

Following the simple rules and organizing your carry-on so screeners can predict what’s inside makes security checkpoints faster and less stressful for everyone.

Key rules to keep you moving through screening:

• Liquids, gels, aerosols: containers must be 100 mL (3.4 oz) or less and fit inside a single clear 1 L resealable bag.
• Duty-free liquids bought after security are allowed in sealed bags with receipt — keep them separate.
• Food: solid foods are fine; liquids and soups follow the 100 mL rule.
• Electronics: laptops must come out unless in a laptop-enabled bag; smaller devices may stay in the carry-on.

Common mistakes:

• Overfilled toiletry bottles, forgetting the 1 L bag, packed liquids in checked carry-on pockets, and not separating electronics at screening.

Tips to move faster:

• Pack liquids in a clearly visible 1 L bag near the top of your carry-on.
• Wear shoes that are easy to remove.
• Keep boarding pass and ID accessible.

Following these simple rules saves time and stress at CATSA checkpoints.