How Strict is WestJet with Carry-on Luggage Size? Space for carry-on luggage may be limited on a few flights. Notwithstanding the space, the lowest fare class in Economy do not allow you to bring a carry-on. Besides this, the size of the carry-on should not exceed what has been laid down. According to WestJet baggage policy, luggage exceeding this limit will go as a checked bag. Here is how it...