We often read that duck cloth and canvas are two diametrically different materials. This is not the case. Duck, whose origin does not come from the animal but from the Dutch "doek" which means "linen cloth", is a cotton cloth with similar characteristics to canvas. The only "difference" lies in the weight of the fabric used, often thinner than canvas, and a tighter weave, with two threads together in the warp and one in the weft.
Cotton canvas and duck cloth are very similar and opposed to other canvas fabrics because they both share a plain weave pattern instead of twill weave one. We can therefore say that duck is a type of cotton canvas.