Backpacks are mostly made of canvas, and there are more and more companies and foreign trade companies. Large companies operate in a wider range of industries. There are also many companies that make luggage products. The rapid growth in demand for luggage lies in its practicality. , multi-purpose, not only do we need to use bags in our lives, bags can also be used as commercial gifts, which is equivalent to spending at low cost to promote the corporate image. The most widely used bags are backpacks, so many companies will find factories to customize backpacks. We need to understand its material for customization. With the increasing demand for backpacks, the competition for backpack customization is also great, so we need to innovate, and the fabrics are no longer single. The fabrics used in clothing are also adapted to backpacks. The functions and usability of backpacks are becoming more and more extensive. The general fabric materials are mainly canvas, Oxford cloth, and PU materials, but most of them will choose canvas fabrics to customize backpacks, because canvas is waterproof and wear-resistant. , fashion, texture, durability and other functions, suitable for a wide range of people, people at all stages. Why do more and more people choose canvas material? Then I should first understand what material canvas is made of. From Du Niang on the Internet, we can learn that canvas is actually cotton or hemp fabric, which is natural and environmentally friendly, but the material is relatively thick. At first, this material was used on sails, so it was known, and then some people used canvas to make other fabrics. Things, such as canvas shoes, backpacks, clothes, etc. In addition, canvas has a distinction of density, different densities, canvas feel, appearance, waterproof, wear resistance, thickness will be different, we use it to make bags. Canvas density is divided into 8 amp canvas, 10 amp canvas, 12 amp canvas, 16 amp canvas, 18 amp canvas, and 20 amp canvas. The width is in inches. There are 58 inches and 44 inches. I want to make a bag. What kind of effect, whether it feels hard or soft, and whether it is waterproof is directly related to the density of the selected canvas. A professional factory will know exactly which fabric is the most suitable for what effect, and what kind of effect will be produced by which fabric.