For air canada:
http://www.aircanada.ca/services/luggage/carry-on.html
CARRY-ON BAGGAGE ALLOWANCE FOR ALL CUSTOMERS
Items, which falls within the 2-piece carry-on allowance, include: Carry-on bags or suitcases (wheels and handles included in the size), briefcases, Laptop computers, diaper bags, camera cases, cartons or other similar items.
** Include all airport and duty free purchases in the carry-on allowance.
(standard article 23cm x 40cm x55cm - Personal article 16cm x 33cm x 43cm)
Yours seems to be too big....