I travel to Canada regularly and have looked into this. From what I can determine:
Fixed blade = ok, and I couldn't find any restrictions on blade length
Two handed opening folders (eg multitool, traditional red Swiss Army Knife) = ok
One handed opening (switchblade, OTF, butterfly, etc) = prohibited
Assisted openers, like Kershaw seem to be prohibited under a customs rule from 2018 (
link)
I check my car/bags to ensure nothing more potent than a multitool and a Swiss Army.
I also do a sweep of the car to make sure I don't have any stray gun stuff (mags etc).
edit - if any questions are asked, your knife is a tool for opening packages and so forth. Not a peep about "just in case" or "self defense"