Ugh.  I hate that response.

I emailed them years ago and at that point they said they didn't manufacture anything that contained sesame.  That was probably 6 years ago.  I try to keep an eye out for new products that could be suspect, but I haven't emailed them again. 

http://pepsico.ca/en/brands/Frito-Lay-Canada.html

I sent an e-mail asking if they label for cross contamination with sesame seeds. Here's response I got.

QuoteThank you for writing to us and inquiring about this ingredient.

As sesame seeds is considered an allergen in Canada, it is required for us to label if a product contains the ingredient but not if the product could come in cross contact. The only allergen we label for a possible cross contact would be peanuts. To clarify, our other top allergens, including sesame seeds, are required to be labeled if the product contains the said ingredient but not if there's a possible cross contamination. We hope that this information has been helpful!

We consider you a valued consumer and hope you will continue to enjoy snacks from PepsiCo Foods Canada.

Should you have additional comments or questions, please call us toll free

This is Lays, FritoLay, Rolled Gold, Spitz, Quaker. Probably more.