Duluth pack

Etymology
Duluth pack is a brand name of the Duluth Tent and Awning Co. They were designed in the early 1880s, but the term is commonly used to refer to any packs of the same style.

Noun

 * 1)  A traditional piece of luggage used in canoe travel, particularly in the Boundary Waters region of northern Minnesota and Ontario. A specialized type of backpack, made of either heavy canvas or nylon, that are approximately square in order to fit easily in the bottom of a canoe.