Knapsack generally choose what material is better.

Because outdoor backpacks are used in special environments, they have higher requirements for knapsack materials and techniques. The positions of all knuckles are sewn three times by sewing stitches, so that the force position is strong and durable. Knuckle buckle and other components can be used to prevent freezing, prevent smashing and deformation at 120 degrees Celsius. The main backpack materials are 420D Oxford nylon, 1000D nylon, 600D or 1000D polyester (polyester), or 1000D CORDVRA and other materials. 1000D material has high density and is very wearable. It is suitable for use in the field. CORDVRA is a famous high-end wear-resistant nylon roving fabric developed by DuPont Co. The wear resistance of the material is much higher than that of nylon or polyester, and it is light in weight. More than 90% of the famous brand backpacks in the world use this long known nylon material. These materials can withstand the pressure of 0.5m~2m and keep the objects in the bag dry. Some materials also have anti tear function. Once punctured, the tear will not tear apart and expand.