I found that there are many times, cross-border use of materials to make backpacks, can get a lot of surprises. In fact, there are very limited materials available for backpack in the market. Although the market is very large, but they have been classified according to their categories, so there are few materials specially used for backpacks in each category. How to develop new materials and make new products? The cross-border use of materials is a way. For example, using the materials used for shoes to make backpacks can bring many surprises, but it doesn’t work every time. It needs to be tried and screened constantly.