Are you talking about a daypack, backpack or canoe pack? Duluth Pack is known for it's canoe packs, of course. Though those packs are OK for portaging, you wouldn't want to carry a full no. 4 Duluth pack very far on a hunting trip. I haven't kept up with their backpack designs, but I agree with the others who have already commented, the heavy canvas is very durable and rugged, and fairly water repellent. In a hunting day pack, the canvas will be rather noisy. Of course, so is most nylon.
I agree with Bigbad that Frost River and Filson are also excellent packs. I believe Duluth Pack changed hands a few years ago. The lead designer/sewer at Frost River previously worked at Duluth Pack. He knows his stuff.