Old Dutch, flavours maybe only in Canada: Ketchup, Dill Pickle, plus the two original Canada-only flavours (going back to my childhood 50 years ago), Onion & Garlic, and Salt & Vinegar.
Old Dutch makes the best BBQ chips as well.
Any "[something} and Black Pepper" flavoured chip, they seem to come and go, Lays have some right now in western Canada.
Hawkins Cheezies (not really a chip).
Ruffles All Dressed.
I know how to make both chips (as in potato chips as sold per above) and fries at home, so that is always an option as well. You can buy the "KD" powdered cheddar at Bulk Barn (aka Kraft Mac & Cheese in the US), that goes on home-made chips and also on popcorn really well.