I grew up in Minnesota and I did a lot of canoeing in the BWCA back then. Duluth Packs were all we used. The heavy canvas bags stood up to the abuse very, very well. Even the kind of abuse that teen-age boys way up on northern lakes could dish out. The only thing we had to watch out for was to dry the bags good when we got done with the trip so they didn't mildew. This was especially true if you managed to dump a canoe on the trip. (Extra credit points if you could get the other guy to dump HIS canoe.)
When I looked at the backpack discussed in the OP, my first thought was that it would make a great pack for when four wheeling back to a camp site. But, honestly, the canoeing packs are half the price and have as much if not more of the volume. I mean, for crying out loud, the #4 Deluxe Duluth Pack is 7,920 cubic inches and it's only $220.
Duluth Packs are actually hand-made in Duluth, MN. And, yes, they will last for generations. IMO, they're well-worth the money if you're canoeing or car camping and you need a big, indestructible canvas bag to lug your gear in. I've never seen a Duluth Pack fail. I have, however, seen plenty of nylon backpacks fall apart.