As of early 2026, Air Canada does not officially have a weight limit for standard carry-on baggage, provided you can stow it in the overhead bin "unaided." Their policy focuses strictly on dimensions; your standard article must not exceed 55 x 40 x 23 cm (including wheels and handles). While they rarely put your bag on a scale at the gate, they are increasingly vigilant about the size of the bag. If your carry-on appears oversized, a gate agent will ask you to place it in the "sizers" located near the boarding area. If it doesn't fit, it will be checked to your final destination, often for a fee if your fare class doesn't include a checked bag. For "Basic Economy" travelers on certain North American routes, the policy is even stricter, sometimes allowing only a personal item. So, while you can technically pack heavy items like books or electronics without fear of a "weight penalty," the physical size of the bag remains the single most important factor for a successful boarding.