A Duluth pack is traditional portage pack used in canoe travel, particularly in the Boundary Waters region of northern Minnesota and the Quetico Provincial Park of Ontario. A specialized type of backpack, Duluth packs are made of heavy canvas, leather, and/or cordura nylon, and are nearly square in order to fit easily in the bottom of a canoe. Originally known as the "Poirier pack" or "Poirier pack-sack" (for its inventor, Camille Poirier), the pack style later became known as the "Duluth pack", as its primary manufacturing company of the same name is located in Duluth, Minnesota.