Here is the same info for the 2 major Canadian Airlines....
Air Canada
Maximum number of bags: 2
Maximum weight per bag: 23 kg (50lb)
Maximum linear dimensions per bag** 158cm 62 cms
(length + width + height)
Excess Baggage Overweight Over 23kg up to 32kg (50lb - 70lb)
Oversized* Between 160cm and 292cm (63in - 115in)
$75 CAD/USD† per bag
If a bag is both overweight and oversized, the charge is applied only once.
Additional baggage
More than 2 bags $100 CAD/USD per bag
Scuba diving equipment Each of the following is considered an individual item when packed separately: empty scuba tank, air supply regulator, pressure gauge, tank harness, face mask, pair of diving fins, snorkel, knife, spear gun, air pistol and safety vest.
All equipment must be securely packed in a rigid and/or hard shell container specifically designed for shipping
Westjet
Excess ChargesExtra Piece $75
A maximum of two excess pieces will be accepted on a space-available basis only per fare paying guest.
Overweight
More than 23 kgs (50 lbs) but not over 45 kgs (100 lbs)*
$40 Per item
Oversize **
(length+width+height) 158 cm - 200cm (62 in - 80 in)
$40 Per item
Scuba Gear
Restricted conditions apply
One set of scuba gear is accepted but all applicable excess fees will be charged per set per direction (extra piece, overweight or oversize).
Cylinders containing compressed air or a special gas mixture are prohibited
WestJet only accepts empty/emptied cylinders (pressure gauge must read zero).
Tank valve must be open.
Diving lamps must be disconnected, with the terminals taped over to prevent accidental functioning during transport.