Canvas is a thick cotton textiles, usually it is plain woven fabric, a few is twill weave fabric, and usually it is divided into two general types, that is thick canvas and thin canvas, the thick canvas could be waterproof very well, it could be used on the vehicle transport，covering open-air warehouse and thesetting up camp. for the thin canvas, it could be used to making the shoes, duffel bags, toolbags and so on.

The unit for the canvas is called “OZ”, 1oz is equal to 28.375g.