In addition to the Arkel post that someone else made, Atwater Atelier also makes bike bags out of Quebec.

Some retailers across the country sell their stuff locally (like Urbane Cyclist out of Toronto), but they have online ordering, too.

I’ve got one of their handlebar bags, and the quality is excellent.

True story: I became aware of the brand when I spotted a cycle tourist while I was on my own ride along the waterfront trail. We rode and chatted (he was from Montreal and doing a cross-Canada ride), and he mentioned the brand after I spotted his Arkel bags, and we got on the topic of bike gear.