You might look at Duluth packs from Duluth Tent and Awning. I have several of their packs I use on canoe expeditions. Well made and a lifetime guarantee. I think they will still make them custom in other colors, besides the ones listed. I have a couple of red ones, as the small green ones are easy to miss on the portage trails. They also make oiled canvas ones. I'm not keen on those as they still let water in and not out.
https://www.duluthpack.com/collections/packs
Erich in Seattle
https://www.duluthpack.com/collections/packs
Erich in Seattle