What about the ticket from China to Toronto?

If you are sure, book the ticket. The earlier you book a ticket, the lower the price, especially for international air tickets. Where are you going? I think it will be cheaper to find a big agent to book tickets because they have multiple sources of air tickets.

The flight from China to Toronto is piece luggage.

Free single baggage allowance

Piece-by-piece baggage allowance is applicable to baggage transportation on international routes between China and the United States and China and Canada. According to the passenger's ticket purchase level, the number of free baggage delivered for each full-price ticket or half-price ticket is: first class and business class, and two pieces of free baggage are delivered, each with a maximum volume of no more than 62 inches (158 cm). For economy class passengers and passengers who use preferential travel fares, the number of luggage checked for free is two, and the maximum volume (sum of three sides) of each piece shall not exceed 62 inches (158 cm), but the sum of the two pieces shall not exceed 107 inches (273 cm), and the maximum weight of each piece shall not exceed 32 kg. Babies who pay 0/0% of the adult fare can check one piece of luggage for free, but the volume (sum of three sides) should not exceed 45 inches (1 15 cm). In addition, a fully foldable or portable stroller or cart can be delivered free of charge. Baggage exceeding the specified quantity and maximum volume shall be paid as overweight baggage.

Carry-on items

In addition to the free checked baggage, each passenger with a full or half-price ticket can also carry the following items for free: a woman's handbag, a coat or raincoat, a blanket for travel, a walking stick or an umbrella, a small amount of reading materials used during the flight, a small camera, a small telescope, baby food (for travel only), a baby cradle (for one only) and a foldable wheel for patients to move.