You are allowed checked in baggage of 23 kgs per bag with the sum of dimensions not to exceed 158 cms in case of Economy Class travel. Business Class travelers are allowed up to 3 bags with each bag not weighing more than 32 kgs and overall dimensions not exceeding 158 cm.
Another important point to note is that there are restrictions of length, sum of dimensions and weight on each baggage for all classes of travel. So, bags of more than 32 kgs of weight or 292 cms linear dimensions (L+B+H+wheels+handles) or 203 cm of length will not be accepted for handling.
Whether you will be allowed to carry more than one baggage and what will be the additional costs of the same will depend on sector of travel.
Additional Check in luggage fees: You will have to pay additional fee if you want to carry baggage which is more than the freely allowed baggage in size, number or weight.
Overweight bags are more than 23 kg and less than 32 kg. Over-sized bags are more than 160 cm and less than 292 cms in linear dimensions.
Infographic on Air Canada Baggage Allowance
For travel within Canada, CAD/USD 75 per bag for one-direction journey applies, if the bag is oversized and/or overweight. First baggage is free. For the second baggage, there is a fee of USD/CAD 20 for Economy Class travel within Canada.If you still want to carry more baggage, additional fee will be USD/CAD 100 per additional bag. In this scenario of carrying more than 2 bags, wherein you have to pay US/CAD 100 fee, there is no separate fee for oversized or overweight baggage.
For flights between US and Canada, a fee of 25 USD or CAD for one-direction of travel is levied even for the first baggage. For second baggage, fee is USD/CAD 35 and for 3rd and more baggages, the fee is CAD/USD 100. Oversized or overweight baggage fee will be USD/CAD 75 per baggage per direction of travel.
Between US and Canada or Mexico, Costa Rica, Caribbean and Bermuda, the fee for second baggage is USD/CAD 35 and for more baggages, it is CAD/USD 225. Oversized/overweight baggage is charged USD/CAD 100 but this will not apply if you are already paying CAD/USD 225 for additional baggage.
Between US and Europe, Middle East, Egypt, Morocco, Malawi and Zambia where the fee for second baggage is USD/CAD 100.
For most other itineraries between US and other destinations the fee for second baggage is USD/CAD 70 and for third baggage is USD/CAD 225.
All these fees are calculated on per-direction basis.
Carry-on/ Hand/ Cabin Baggage: You are allowed to carry two items as carry on baggage, one standard article and the other a personal item. Air Canada is very particular about oversized hand or cabin luggage and it will not allow you to carry the oversized bags on-board. The standard article shall be of maximum size 23, 40 and 55 cms (including wheels and handles) and of weight up to 10 kgs. The personal article shall not be exceeding 16, 33, 43 cms of dimensions and 10 kgs of weight.
While traveling with an infant, you are allowed to carry 1 more standard article in the cabin.
Overcoat, wrap, small purse (up to dimensions of 25, 30 and 14 cms), mobility aids, medications, battery operated medical equipment and food to be consumed in-flight by infant is also allowed inside the cabin.
Sporting equipment, pets, musical instruments and hunting equipment are some of the other special baggage items which are allowed as checked in or hand baggage. However, there might be special charges, waivers and packing instructions for this luggage.
Sporting equipment includes archery items, avalanche rescue items, bicycles, boating/fishing, broomball/curling equipments, firearms for sports, golf clubs, hockey/cricket/ringette/lacrosse equipment, kiteboards and skateboards, parachutes, racquets, scuba diving, skeleton sleds, skis, skates, snowboards, Inflatable balls, bowling balls and surfboards.
Hunting equipment include Antlers and horns, ammunition, archery equipment, firearms and fishing equipment.
Musical equipments are accepted as carry on and checked in baggage provided they meet all restrictions of dimensions, weight and numbers.
Pets can be carried in three different ways on Air Canada. One way is to carry it in cabin. For this, it will be counted as 1 standard items towards free luggage allowance. Maximum weight allowed is 10 kgs and dimensions of hard and soft sided carriers shall be (23, 40, 55 cms) and (27, 40, 55 cms) respectively. If not counted as free baggage, the charges are CAD/USD 50 within USA and Canada and CAD/USD 100 for international travel.
The second option is to carry the pets in the baggage compartment. In this case the total of dimensions of carrier shall be 292 cms and maximum weight will be 32 kgs. The charges for carrying these within Canada and US are USD/CAD 105 and for international travel are CAD/USD 270. These charges are for one-way travel.
The third option is to make use of the cargo service of the airlines for this purpose.