According to the Government of Canada and the Canadian Air Transport Security Authority (CATSA), it is highly recommended that you keep all medications in their original, labeled containers. While it is not a strict "legal" requirement for all domestic travel, having the original packaging with the prescription label (showing your name and the doctor's name) significantly speeds up the security screening process and prevents any misunderstanding about the nature of the pills. This is especially critical for liquid, gel, or aerosol medications, which are exempt from the standard 100ml volume restrictions but must be declared to the screening officer. If you choose to use a pill organizer for convenience, it is a "pro-traveler" tip to carry a photocopy of your official prescriptions or a note from your doctor. For international flights departing from Canada, original bottles are almost always mandatory to satisfy the customs and drug laws of the destination country.