Every airline has its own policy about carry-ons. With WestJet, you can bring a backpack, tote, or similar item that has dimensions of no more than 53 cm x 23 cm x 38 cm, as well as a personal item, such as a laptop, camera, or garment bag no larger than 41 cm x 15 cm x 33 cm. If you are traveling with an infant, you can also bring a diaper bag.