The laws in Canada aren't terribly restrictive, and are almost completely nonexistant as far as multis are concerned. The law here states that knives are legal provided they don't open by button actuated spring (autos are illegal, but assisted openers are fine), gravity or centrfugal force, so no balisongs either. Anything else is legal provided you are not concealing it (yes, you can carry a 48" katana legally) or using it in a threatening manner. Anything used in a threatening manner is considered a weapon, be it a 2x4, knife, multi, car or what have you.
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